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diff --git a/upstream/debian-bookworm/man1/rsync.1 b/upstream/debian-bookworm/man1/rsync.1 new file mode 100644 index 00000000..66a2da39 --- /dev/null +++ b/upstream/debian-bookworm/man1/rsync.1 @@ -0,0 +1,5051 @@ +.TH "rsync" "1" "20 Oct 2022" "rsync 3.2.7" "User Commands" +.\" prefix=/usr +.P +.SH "NAME" +.P +rsync \- a fast, versatile, remote (and local) file-copying tool +.P +.SH "SYNOPSIS" +.P +.nf +Local: + rsync [OPTION...] SRC... [DEST] + +Access via remote shell: + Pull: + rsync [OPTION...] [USER@]HOST:SRC... [DEST] + Push: + rsync [OPTION...] SRC... [USER@]HOST:DEST + +Access via rsync daemon: + Pull: + rsync [OPTION...] [USER@]HOST::SRC... [DEST] + rsync [OPTION...] rsync://[USER@]HOST[:PORT]/SRC... [DEST] + Push: + rsync [OPTION...] SRC... [USER@]HOST::DEST + rsync [OPTION...] SRC... rsync://[USER@]HOST[:PORT]/DEST) +.fi +.P +Usages with just one SRC arg and no DEST arg will list the source files instead +of copying. +.P +The online version of this manpage (that includes cross-linking of topics) +is available at https://download.samba.org/pub/rsync/rsync.1. +.P +.SH "DESCRIPTION" +.P +Rsync is a fast and extraordinarily versatile file copying tool. It can copy +locally, to/from another host over any remote shell, or to/from a remote rsync +daemon. It offers a large number of options that control every aspect of its +behavior and permit very flexible specification of the set of files to be +copied. It is famous for its delta-transfer algorithm, which reduces the +amount of data sent over the network by sending only the differences between +the source files and the existing files in the destination. Rsync is widely +used for backups and mirroring and as an improved copy command for everyday +use. +.P +Rsync finds files that need to be transferred using a "quick check" algorithm +(by default) that looks for files that have changed in size or in last-modified +time. Any changes in the other preserved attributes (as requested by options) +are made on the destination file directly when the quick check indicates that +the file's data does not need to be updated. +.P +Some of the additional features of rsync are: +.P +.IP o +support for copying links, devices, owners, groups, and permissions +.IP o +exclude and exclude-from options similar to GNU tar +.IP o +a CVS exclude mode for ignoring the same files that CVS would ignore +.IP o +can use any transparent remote shell, including ssh or rsh +.IP o +does not require super-user privileges +.IP o +pipelining of file transfers to minimize latency costs +.IP o +support for anonymous or authenticated rsync daemons (ideal for mirroring) +.P +.SH "GENERAL" +.P +Rsync copies files either to or from a remote host, or locally on the current +host (it does not support copying files between two remote hosts). +.P +There are two different ways for rsync to contact a remote system: using a +remote-shell program as the transport (such as ssh or rsh) or contacting an +rsync daemon directly via TCP. The remote-shell transport is used whenever the +source or destination path contains a single colon (:) separator after a host +specification. Contacting an rsync daemon directly happens when the source or +destination path contains a double colon (::) separator after a host +specification, OR when an rsync:// URL is specified (see also the USING +RSYNC-DAEMON FEATURES VIA A REMOTE-SHELL CONNECTION section for an +exception to this latter rule). +.P +As a special case, if a single source arg is specified without a destination, +the files are listed in an output format similar to "\fBls\ \-l\fP". +.P +As expected, if neither the source or destination path specify a remote host, +the copy occurs locally (see also the \fB\-\-list-only\fP option). +.P +Rsync refers to the local side as the client and the remote side as the server. +Don't confuse server with an rsync daemon. A daemon is always a server, but a +server can be either a daemon or a remote-shell spawned process. +.P +.SH "SETUP" +.P +See the file README.md for installation instructions. +.P +Once installed, you can use rsync to any machine that you can access via a +remote shell (as well as some that you can access using the rsync daemon-mode +protocol). For remote transfers, a modern rsync uses ssh for its +communications, but it may have been configured to use a different remote shell +by default, such as rsh or remsh. +.P +You can also specify any remote shell you like, either by using the \fB\-e\fP +command line option, or by setting the \fBRSYNC_RSH\fP environment variable. +.P +Note that rsync must be installed on both the source and destination machines. +.P +.SH "USAGE" +.P +You use rsync in the same way you use rcp. You must specify a source and a +destination, one of which may be remote. +.P +Perhaps the best way to explain the syntax is with some examples: +.RS 4 +.P +.nf +rsync -t *.c foo:src/ +.fi +.RE +.P +This would transfer all files matching the pattern \fB*.c\fP from the current +directory to the directory src on the machine foo. If any of the files already +exist on the remote system then the rsync remote-update protocol is used to +update the file by sending only the differences in the data. Note that the +expansion of wildcards on the command-line (\fB*.c\fP) into a list of files is +handled by the shell before it runs rsync and not by rsync itself (exactly the +same as all other Posix-style programs). +.RS 4 +.P +.nf +rsync -avz foo:src/bar /data/tmp +.fi +.RE +.P +This would recursively transfer all files from the directory src/bar on the +machine foo into the /data/tmp/bar directory on the local machine. The files +are transferred in archive mode, which ensures that symbolic links, devices, +attributes, permissions, ownerships, etc. are preserved in the transfer. +Additionally, compression will be used to reduce the size of data portions of +the transfer. +.RS 4 +.P +.nf +rsync -avz foo:src/bar/ /data/tmp +.fi +.RE +.P +A trailing slash on the source changes this behavior to avoid creating an +additional directory level at the destination. You can think of a trailing / +on a source as meaning "copy the contents of this directory" as opposed to +"copy the directory by name", but in both cases the attributes of the +containing directory are transferred to the containing directory on the +destination. In other words, each of the following commands copies the files +in the same way, including their setting of the attributes of /dest/foo: +.RS 4 +.P +.nf +rsync -av /src/foo /dest +rsync -av /src/foo/ /dest/foo +.fi +.RE +.P +Note also that host and module references don't require a trailing slash to +copy the contents of the default directory. For example, both of these copy +the remote directory's contents into "/dest": +.RS 4 +.P +.nf +rsync -av host: /dest +rsync -av host::module /dest +.fi +.RE +.P +You can also use rsync in local-only mode, where both the source and +destination don't have a ':' in the name. In this case it behaves like an +improved copy command. +.P +Finally, you can list all the (listable) modules available from a particular +rsync daemon by leaving off the module name: +.RS 4 +.P +.nf +rsync somehost.mydomain.com:: +.fi +.RE +.P +.SH "COPYING TO A DIFFERENT NAME" +.P +When you want to copy a directory to a different name, use a trailing slash on +the source directory to put the contents of the directory into any destination +directory you like: +.RS 4 +.P +.nf +rsync -ai foo/ bar/ +.fi +.RE +.P +Rsync also has the ability to customize a destination file's name when copying +a single item. The rules for this are: +.P +.IP o +The transfer list must consist of a single item (either a file or an empty +directory) +.IP o +The final element of the destination path must not exist as a directory +.IP o +The destination path must not have been specified with a trailing slash +.P +Under those circumstances, rsync will set the name of the destination's single +item to the last element of the destination path. Keep in mind that it is best +to only use this idiom when copying a file and use the above trailing-slash +idiom when copying a directory. +.P +The following example copies the \fBfoo.c\fP file as \fBbar.c\fP in the \fBsave\fP dir +(assuming that \fBbar.c\fP isn't a directory): +.RS 4 +.P +.nf +rsync -ai src/foo.c save/bar.c +.fi +.RE +.P +The single-item copy rule might accidentally bite you if you unknowingly copy a +single item and specify a destination dir that doesn't exist (without using a +trailing slash). For example, if \fBsrc/*.c\fP matches one file and \fBsave/dir\fP +doesn't exist, this will confuse you by naming the destination file \fBsave/dir\fP: +.RS 4 +.P +.nf +rsync -ai src/*.c save/dir +.fi +.RE +.P +To prevent such an accident, either make sure the destination dir exists or +specify the destination path with a trailing slash: +.RS 4 +.P +.nf +rsync -ai src/*.c save/dir/ +.fi +.RE +.P +.SH "SORTED TRANSFER ORDER" +.P +Rsync always sorts the specified filenames into its internal transfer list. +This handles the merging together of the contents of identically named +directories, makes it easy to remove duplicate filenames. It can, however, +confuse someone when the files are transferred in a different order than what +was given on the command-line. +.P +If you need a particular file to be transferred prior to another, either +separate the files into different rsync calls, or consider using +\fB\-\-delay-updates\fP (which doesn't affect the sorted transfer order, but +does make the final file-updating phase happen much more rapidly). +.P +.SH "MULTI-HOST SECURITY" +.P +Rsync takes steps to ensure that the file requests that are shared in a +transfer are protected against various security issues. Most of the potential +problems arise on the receiving side where rsync takes steps to ensure that the +list of files being transferred remains within the bounds of what was +requested. +.P +Toward this end, rsync 3.1.2 and later have aborted when a file list contains +an absolute or relative path that tries to escape out of the top of the +transfer. Also, beginning with version 3.2.5, rsync does two more safety +checks of the file list to (1) ensure that no extra source arguments were added +into the transfer other than those that the client requested and (2) ensure +that the file list obeys the exclude rules that were sent to the sender. +.P +For those that don't yet have a 3.2.5 client rsync (or those that want to be +extra careful), it is safest to do a copy into a dedicated destination +directory for the remote files when you don't trust the remote host. For +example, instead of doing an rsync copy into your home directory: +.RS 4 +.P +.nf +rsync -aiv host1:dir1 ~ +.fi +.RE +.P +Dedicate a "host1-files" dir to the remote content: +.RS 4 +.P +.nf +rsync -aiv host1:dir1 ~/host1-files +.fi +.RE +.P +See the \fB\-\-trust-sender\fP option for additional details. +.P +CAUTION: it is not particularly safe to use rsync to copy files from a +case-preserving filesystem to a case-ignoring filesystem. If you must perform +such a copy, you should either disable symlinks via \fB\-\-no-links\fP or enable the +munging of symlinks via \fB\-\-munge-links\fP (and make sure you use the +right local or remote option). This will prevent rsync from doing potentially +dangerous things if a symlink name overlaps with a file or directory. It does +not, however, ensure that you get a full copy of all the files (since that may +not be possible when the names overlap). A potentially better solution is to +list all the source files and create a safe list of filenames that you pass to +the \fB\-\-files-from\fP option. Any files that conflict in name would need +to be copied to different destination directories using more than one copy. +.P +While a copy of a case-ignoring filesystem to a case-ignoring filesystem can +work out fairly well, if no \fB\-\-delete-during\fP or \fB\-\-delete-before\fP option is +active, rsync can potentially update an existing file on the receiveing side +without noticing that the upper-/lower-case of the filename should be changed +to match the sender. +.P +.SH "ADVANCED USAGE" +.P +The syntax for requesting multiple files from a remote host is done by +specifying additional remote-host args in the same style as the first, or with +the hostname omitted. For instance, all these work: +.RS 4 +.P +.nf +rsync -aiv host:file1 :file2 host:file{3,4} /dest/ +rsync -aiv host::modname/file{1,2} host::modname/extra /dest/ +rsync -aiv host::modname/first ::extra-file{1,2} /dest/ +.fi +.RE +.P +Note that a daemon connection only supports accessing one module per copy +command, so if the start of a follow-up path doesn't begin with the +modname of the first path, it is assumed to be a path in the module (such as +the extra-file1 & extra-file2 that are grabbed above). +.P +Really old versions of rsync (2.6.9 and before) only allowed specifying one +remote-source arg, so some people have instead relied on the remote-shell +performing space splitting to break up an arg into multiple paths. Such +unintuitive behavior is no longer supported by default (though you can request +it, as described below). +.P +Starting in 3.2.4, filenames are passed to a remote shell in such a way as to +preserve the characters you give it. Thus, if you ask for a file with spaces +in the name, that's what the remote rsync looks for: +.RS 4 +.P +.nf +rsync -aiv host:'a simple file.pdf' /dest/ +.fi +.RE +.P +If you use scripts that have been written to manually apply extra quoting to +the remote rsync args (or to require remote arg splitting), you can ask rsync +to let your script handle the extra escaping. This is done by either adding +the \fB\-\-old-args\fP option to the rsync runs in the script (which requires +a new rsync) or exporting RSYNC_OLD_ARGS=1 and RSYNC_PROTECT_ARGS=0 +(which works with old or new rsync versions). +.P +.SH "CONNECTING TO AN RSYNC DAEMON" +.P +It is also possible to use rsync without a remote shell as the transport. In +this case you will directly connect to a remote rsync daemon, typically using +TCP port 873. (This obviously requires the daemon to be running on the remote +system, so refer to the STARTING AN RSYNC DAEMON TO ACCEPT CONNECTIONS +section below for information on that.) +.P +Using rsync in this way is the same as using it with a remote shell except +that: +.P +.IP o +Use either double-colon syntax or rsync:// URL syntax instead of the +single-colon (remote shell) syntax. +.IP o +The first element of the "path" is actually a module name. +.IP o +Additional remote source args can use an abbreviated syntax that omits the +hostname and/or the module name, as discussed in ADVANCED USAGE. +.IP o +The remote daemon may print a "message of the day" when you connect. +.IP o +If you specify only the host (with no module or path) then a list of +accessible modules on the daemon is output. +.IP o +If you specify a remote source path but no destination, a listing of the +matching files on the remote daemon is output. +.IP o +The \fB\-\-rsh\fP (\fB\-e\fP) option must be omitted to avoid changing the +connection style from using a socket connection to USING RSYNC-DAEMON +FEATURES VIA A REMOTE-SHELL CONNECTION. +.P +An example that copies all the files in a remote module named "src": +.RS 4 +.P +.nf +rsync -av host::src /dest +.fi +.RE +.P +Some modules on the remote daemon may require authentication. If so, you will +receive a password prompt when you connect. You can avoid the password prompt +by setting the environment variable \fBRSYNC_PASSWORD\fP to the password you +want to use or using the \fB\-\-password-file\fP option. This may be useful +when scripting rsync. +.P +WARNING: On some systems environment variables are visible to all users. On +those systems using \fB\-\-password-file\fP is recommended. +.P +You may establish the connection via a web proxy by setting the environment +variable \fBRSYNC_PROXY\fP to a hostname:port pair pointing to your web proxy. +Note that your web proxy's configuration must support proxy connections to port +873. +.P +You may also establish a daemon connection using a program as a proxy by +setting the environment variable \fBRSYNC_CONNECT_PROG\fP to the commands you +wish to run in place of making a direct socket connection. The string may +contain the escape "%H" to represent the hostname specified in the rsync +command (so use "%%" if you need a single "%" in your string). For example: +.RS 4 +.P +.nf +export RSYNC_CONNECT_PROG='ssh proxyhost nc %H 873' +rsync -av targethost1::module/src/ /dest/ +rsync -av rsync://targethost2/module/src/ /dest/ +.fi +.RE +.P +The command specified above uses ssh to run nc (netcat) on a proxyhost, which +forwards all data to port 873 (the rsync daemon) on the targethost (%H). +.P +Note also that if the \fBRSYNC_SHELL\fP environment variable is set, that +program will be used to run the \fBRSYNC_CONNECT_PROG\fP command instead of using +the default shell of the \fBsystem()\fP call. +.P +.SH "USING RSYNC-DAEMON FEATURES VIA A REMOTE-SHELL CONNECTION" +.P +It is sometimes useful to use various features of an rsync daemon (such as +named modules) without actually allowing any new socket connections into a +system (other than what is already required to allow remote-shell access). +Rsync supports connecting to a host using a remote shell and then spawning a +single-use "daemon" server that expects to read its config file in the home dir +of the remote user. This can be useful if you want to encrypt a daemon-style +transfer's data, but since the daemon is started up fresh by the remote user, +you may not be able to use features such as chroot or change the uid used by +the daemon. (For another way to encrypt a daemon transfer, consider using ssh +to tunnel a local port to a remote machine and configure a normal rsync daemon +on that remote host to only allow connections from "localhost".) +.P +From the user's perspective, a daemon transfer via a remote-shell connection +uses nearly the same command-line syntax as a normal rsync-daemon transfer, +with the only exception being that you must explicitly set the remote shell +program on the command-line with the \fB\-\-rsh=COMMAND\fP option. (Setting the +RSYNC_RSH in the environment will not turn on this functionality.) For example: +.RS 4 +.P +.nf +rsync -av --rsh=ssh host::module /dest +.fi +.RE +.P +If you need to specify a different remote-shell user, keep in mind that the +user@ prefix in front of the host is specifying the rsync-user value (for a +module that requires user-based authentication). This means that you must give +the '\-l user' option to ssh when specifying the remote-shell, as in this +example that uses the short version of the \fB\-\-rsh\fP option: +.RS 4 +.P +.nf +rsync -av -e "ssh -l ssh-user" rsync-user@host::module /dest +.fi +.RE +.P +The "ssh-user" will be used at the ssh level; the "rsync-user" will be used to +log-in to the "module". +.P +In this setup, the daemon is started by the ssh command that is accessing the +system (which can be forced via the \fB~/.ssh/authorized_keys\fP file, if desired). +However, when accessing a daemon directly, it needs to be started beforehand. +.P +.SH "STARTING AN RSYNC DAEMON TO ACCEPT CONNECTIONS" +.P +In order to connect to an rsync daemon, the remote system needs to have a +daemon already running (or it needs to have configured something like inetd to +spawn an rsync daemon for incoming connections on a particular port). For full +information on how to start a daemon that will handling incoming socket +connections, see the \fBrsyncd.conf\fP(5) manpage\ \-\- that is +the config file for the daemon, and it contains the full details for how to run +the daemon (including stand-alone and inetd configurations). +.P +If you're using one of the remote-shell transports for the transfer, there is +no need to manually start an rsync daemon. +.P +.SH "EXAMPLES" +.P +Here are some examples of how rsync can be used. +.P +To backup a home directory, which consists of large MS Word files and mail +folders, a per-user cron job can be used that runs this each day: +.RS 4 +.P +.nf +rsync -aiz . bkhost:backup/joe/ +.fi +.RE +.P +To move some files from a remote host to the local host, you could run: +.RS 4 +.P +.nf +rsync -aiv --remove-source-files rhost:/tmp/{file1,file2}.c ~/src/ +.fi +.RE +.P +.SH "OPTION SUMMARY" +.P +Here is a short summary of the options available in rsync. Each option also +has its own detailed description later in this manpage. +.P +.nf +--verbose, -v increase verbosity +--info=FLAGS fine-grained informational verbosity +--debug=FLAGS fine-grained debug verbosity +--stderr=e|a|c change stderr output mode (default: errors) +--quiet, -q suppress non-error messages +--no-motd suppress daemon-mode MOTD +--checksum, -c skip based on checksum, not mod-time & size +--archive, -a archive mode is -rlptgoD (no -A,-X,-U,-N,-H) +--no-OPTION turn off an implied OPTION (e.g. --no-D) +--recursive, -r recurse into directories +--relative, -R use relative path names +--no-implied-dirs don't send implied dirs with --relative +--backup, -b make backups (see --suffix & --backup-dir) +--backup-dir=DIR make backups into hierarchy based in DIR +--suffix=SUFFIX backup suffix (default ~ w/o --backup-dir) +--update, -u skip files that are newer on the receiver +--inplace update destination files in-place +--append append data onto shorter files +--append-verify --append w/old data in file checksum +--dirs, -d transfer directories without recursing +--old-dirs, --old-d works like --dirs when talking to old rsync +--mkpath create destination's missing path components +--links, -l copy symlinks as symlinks +--copy-links, -L transform symlink into referent file/dir +--copy-unsafe-links only "unsafe" symlinks are transformed +--safe-links ignore symlinks that point outside the tree +--munge-links munge symlinks to make them safe & unusable +--copy-dirlinks, -k transform symlink to dir into referent dir +--keep-dirlinks, -K treat symlinked dir on receiver as dir +--hard-links, -H preserve hard links +--perms, -p preserve permissions +--executability, -E preserve executability +--chmod=CHMOD affect file and/or directory permissions +--acls, -A preserve ACLs (implies --perms) +--xattrs, -X preserve extended attributes +--owner, -o preserve owner (super-user only) +--group, -g preserve group +--devices preserve device files (super-user only) +--copy-devices copy device contents as a regular file +--write-devices write to devices as files (implies --inplace) +--specials preserve special files +-D same as --devices --specials +--times, -t preserve modification times +--atimes, -U preserve access (use) times +--open-noatime avoid changing the atime on opened files +--crtimes, -N preserve create times (newness) +--omit-dir-times, -O omit directories from --times +--omit-link-times, -J omit symlinks from --times +--super receiver attempts super-user activities +--fake-super store/recover privileged attrs using xattrs +--sparse, -S turn sequences of nulls into sparse blocks +--preallocate allocate dest files before writing them +--dry-run, -n perform a trial run with no changes made +--whole-file, -W copy files whole (w/o delta-xfer algorithm) +--checksum-choice=STR choose the checksum algorithm (aka --cc) +--one-file-system, -x don't cross filesystem boundaries +--block-size=SIZE, -B force a fixed checksum block-size +--rsh=COMMAND, -e specify the remote shell to use +--rsync-path=PROGRAM specify the rsync to run on remote machine +--existing skip creating new files on receiver +--ignore-existing skip updating files that exist on receiver +--remove-source-files sender removes synchronized files (non-dir) +--del an alias for --delete-during +--delete delete extraneous files from dest dirs +--delete-before receiver deletes before xfer, not during +--delete-during receiver deletes during the transfer +--delete-delay find deletions during, delete after +--delete-after receiver deletes after transfer, not during +--delete-excluded also delete excluded files from dest dirs +--ignore-missing-args ignore missing source args without error +--delete-missing-args delete missing source args from destination +--ignore-errors delete even if there are I/O errors +--force force deletion of dirs even if not empty +--max-delete=NUM don't delete more than NUM files +--max-size=SIZE don't transfer any file larger than SIZE +--min-size=SIZE don't transfer any file smaller than SIZE +--max-alloc=SIZE change a limit relating to memory alloc +--partial keep partially transferred files +--partial-dir=DIR put a partially transferred file into DIR +--delay-updates put all updated files into place at end +--prune-empty-dirs, -m prune empty directory chains from file-list +--numeric-ids don't map uid/gid values by user/group name +--usermap=STRING custom username mapping +--groupmap=STRING custom groupname mapping +--chown=USER:GROUP simple username/groupname mapping +--timeout=SECONDS set I/O timeout in seconds +--contimeout=SECONDS set daemon connection timeout in seconds +--ignore-times, -I don't skip files that match size and time +--size-only skip files that match in size +--modify-window=NUM, -@ set the accuracy for mod-time comparisons +--temp-dir=DIR, -T create temporary files in directory DIR +--fuzzy, -y find similar file for basis if no dest file +--compare-dest=DIR also compare destination files relative to DIR +--copy-dest=DIR ... and include copies of unchanged files +--link-dest=DIR hardlink to files in DIR when unchanged +--compress, -z compress file data during the transfer +--compress-choice=STR choose the compression algorithm (aka --zc) +--compress-level=NUM explicitly set compression level (aka --zl) +--skip-compress=LIST skip compressing files with suffix in LIST +--cvs-exclude, -C auto-ignore files in the same way CVS does +--filter=RULE, -f add a file-filtering RULE +-F same as --filter='dir-merge /.rsync-filter' + repeated: --filter='- .rsync-filter' +--exclude=PATTERN exclude files matching PATTERN +--exclude-from=FILE read exclude patterns from FILE +--include=PATTERN don't exclude files matching PATTERN +--include-from=FILE read include patterns from FILE +--files-from=FILE read list of source-file names from FILE +--from0, -0 all *-from/filter files are delimited by 0s +--old-args disable the modern arg-protection idiom +--secluded-args, -s use the protocol to safely send the args +--trust-sender trust the remote sender's file list +--copy-as=USER[:GROUP] specify user & optional group for the copy +--address=ADDRESS bind address for outgoing socket to daemon +--port=PORT specify double-colon alternate port number +--sockopts=OPTIONS specify custom TCP options +--blocking-io use blocking I/O for the remote shell +--outbuf=N|L|B set out buffering to None, Line, or Block +--stats give some file-transfer stats +--8-bit-output, -8 leave high-bit chars unescaped in output +--human-readable, -h output numbers in a human-readable format +--progress show progress during transfer +-P same as --partial --progress +--itemize-changes, -i output a change-summary for all updates +--remote-option=OPT, -M send OPTION to the remote side only +--out-format=FORMAT output updates using the specified FORMAT +--log-file=FILE log what we're doing to the specified FILE +--log-file-format=FMT log updates using the specified FMT +--password-file=FILE read daemon-access password from FILE +--early-input=FILE use FILE for daemon's early exec input +--list-only list the files instead of copying them +--bwlimit=RATE limit socket I/O bandwidth +--stop-after=MINS Stop rsync after MINS minutes have elapsed +--stop-at=y-m-dTh:m Stop rsync at the specified point in time +--fsync fsync every written file +--write-batch=FILE write a batched update to FILE +--only-write-batch=FILE like --write-batch but w/o updating dest +--read-batch=FILE read a batched update from FILE +--protocol=NUM force an older protocol version to be used +--iconv=CONVERT_SPEC request charset conversion of filenames +--checksum-seed=NUM set block/file checksum seed (advanced) +--ipv4, -4 prefer IPv4 +--ipv6, -6 prefer IPv6 +--version, -V print the version + other info and exit +--help, -h (*) show this help (* -h is help only on its own) +.fi +.P +Rsync can also be run as a daemon, in which case the following options are +accepted: +.P +.nf +--daemon run as an rsync daemon +--address=ADDRESS bind to the specified address +--bwlimit=RATE limit socket I/O bandwidth +--config=FILE specify alternate rsyncd.conf file +--dparam=OVERRIDE, -M override global daemon config parameter +--no-detach do not detach from the parent +--port=PORT listen on alternate port number +--log-file=FILE override the "log file" setting +--log-file-format=FMT override the "log format" setting +--sockopts=OPTIONS specify custom TCP options +--verbose, -v increase verbosity +--ipv4, -4 prefer IPv4 +--ipv6, -6 prefer IPv6 +--help, -h show this help (when used with --daemon) +.fi +.P +.SH "OPTIONS" +.P +Rsync accepts both long (double-dash + word) and short (single-dash + letter) +options. The full list of the available options are described below. If an +option can be specified in more than one way, the choices are comma-separated. +Some options only have a long variant, not a short. +.P +If the option takes a parameter, the parameter is only listed after the long +variant, even though it must also be specified for the short. When specifying +a parameter, you can either use the form \fB\-\-option=param\fP, \fB\-\-option\ param\fP, +\fB\-o=param\fP, \fB\-o\ param\fP, or \fB\-oparam\fP (the latter choices assume that your +option has a short variant). +.P +The parameter may need to be quoted in some manner for it to survive the +shell's command-line parsing. Also keep in mind that a leading tilde (\fB~\fP) in +a pathname is substituted by your shell, so make sure that you separate the +option name from the pathname using a space if you want the local shell to +expand it. +.P +.IP "\fB\-\-help\fP" +Print a short help page describing the options available in rsync and exit. +You can also use \fB\-h\fP for \fB\-\-help\fP when it is used without any other +options (since it normally means \fB\-\-human-readable\fP). +.IP "\fB\-\-version\fP, \fB\-V\fP" +Print the rsync version plus other info and exit. When repeated, the +information is output is a JSON format that is still fairly readable +(client side only). +.IP +The output includes a list of compiled-in capabilities, a list of +optimizations, the default list of checksum algorithms, the default list of +compression algorithms, the default list of daemon auth digests, a link to +the rsync web site, and a few other items. +.IP "\fB\-\-verbose\fP, \fB\-v\fP" +This option increases the amount of information you are given during the +transfer. By default, rsync works silently. A single \fB\-v\fP will give you +information about what files are being transferred and a brief summary at +the end. Two \fB\-v\fP options will give you information on what files are +being skipped and slightly more information at the end. More than two \fB\-v\fP +options should only be used if you are debugging rsync. +.IP +The end-of-run summary tells you the number of bytes sent to the remote +rsync (which is the receiving side on a local copy), the number of bytes +received from the remote host, and the average bytes per second of the +transferred data computed over the entire length of the rsync run. The +second line shows the total size (in bytes), which is the sum of all the +file sizes that rsync considered transferring. It also shows a "speedup" +value, which is a ratio of the total file size divided by the sum of the +sent and received bytes (which is really just a feel-good bigger-is-better +number). Note that these byte values can be made more (or less) +human-readable by using the \fB\-\-human-readable\fP (or +\fB\-\-no-human-readable\fP) options. +.IP +In a modern rsync, the \fB\-v\fP option is equivalent to the setting of groups +of \fB\-\-info\fP and \fB\-\-debug\fP options. You can choose to use +these newer options in addition to, or in place of using \fB\-\-verbose\fP, as +any fine-grained settings override the implied settings of \fB\-v\fP. Both +\fB\-\-info\fP and \fB\-\-debug\fP have a way to ask for help that +tells you exactly what flags are set for each increase in verbosity. +.IP +However, do keep in mind that a daemon's "\fBmax\ verbosity\fP" setting will limit +how high of a level the various individual flags can be set on the daemon +side. For instance, if the max is 2, then any info and/or debug flag that +is set to a higher value than what would be set by \fB\-vv\fP will be downgraded +to the \fB\-vv\fP level in the daemon's logging. +.IP "\fB\-\-info=FLAGS\fP" +This option lets you have fine-grained control over the information output +you want to see. An individual flag name may be followed by a level +number, with 0 meaning to silence that output, 1 being the default output +level, and higher numbers increasing the output of that flag (for those +that support higher levels). Use \fB\-\-info=help\fP to see all the available +flag names, what they output, and what flag names are added for each +increase in the verbose level. Some examples: +.RS 4 +.IP +.nf +rsync -a --info=progress2 src/ dest/ +rsync -avv --info=stats2,misc1,flist0 src/ dest/ +.fi +.RE +.IP +Note that \fB\-\-info=name\fP's output is affected by the \fB\-\-out-format\fP +and \fB\-\-itemize-changes\fP (\fB\-i\fP) options. See those options for more +information on what is output and when. +.IP +This option was added to 3.1.0, so an older rsync on the server side might +reject your attempts at fine-grained control (if one or more flags needed +to be send to the server and the server was too old to understand them). +See also the "\fBmax\ verbosity\fP" caveat above when dealing with a daemon. +.IP "\fB\-\-debug=FLAGS\fP" +This option lets you have fine-grained control over the debug output you +want to see. An individual flag name may be followed by a level number, +with 0 meaning to silence that output, 1 being the default output level, +and higher numbers increasing the output of that flag (for those that +support higher levels). Use \fB\-\-debug=help\fP to see all the available flag +names, what they output, and what flag names are added for each increase in +the verbose level. Some examples: +.RS 4 +.IP +.nf +rsync -avvv --debug=none src/ dest/ +rsync -avA --del --debug=del2,acl src/ dest/ +.fi +.RE +.IP +Note that some debug messages will only be output when the \fB\-\-stderr=all\fP +option is specified, especially those pertaining to I/O and buffer debugging. +.IP +Beginning in 3.2.0, this option is no longer auto-forwarded to the server +side in order to allow you to specify different debug values for each side +of the transfer, as well as to specify a new debug option that is only +present in one of the rsync versions. If you want to duplicate the same +option on both sides, using brace expansion is an easy way to save you some +typing. This works in zsh and bash: +.RS 4 +.IP +.nf +rsync -aiv {-M,}--debug=del2 src/ dest/ +.fi +.RE +.IP "\fB\-\-stderr=errors|all|client\fP" +This option controls which processes output to stderr and if info messages +are also changed to stderr. The mode strings can be abbreviated, so feel +free to use a single letter value. The 3 possible choices are: +.IP +.RS +.IP o +\fBerrors\fP \- (the default) causes all the rsync processes to send an +error directly to stderr, even if the process is on the remote side of +the transfer. Info messages are sent to the client side via the protocol +stream. If stderr is not available (i.e. when directly connecting with a +daemon via a socket) errors fall back to being sent via the protocol +stream. +.IP o +\fBall\fP \- causes all rsync messages (info and error) to get written +directly to stderr from all (possible) processes. This causes stderr to +become line-buffered (instead of raw) and eliminates the ability to +divide up the info and error messages by file handle. For those doing +debugging or using several levels of verbosity, this option can help to +avoid clogging up the transfer stream (which should prevent any chance of +a deadlock bug hanging things up). It also allows \fB\-\-debug\fP to +enable some extra I/O related messages. +.IP o +\fBclient\fP \- causes all rsync messages to be sent to the client side +via the protocol stream. One client process outputs all messages, with +errors on stderr and info messages on stdout. This \fBwas\fP the default +in older rsync versions, but can cause error delays when a lot of +transfer data is ahead of the messages. If you're pushing files to an +older rsync, you may want to use \fB\-\-stderr=all\fP since that idiom has +been around for several releases. +.RE +.IP +This option was added in rsync 3.2.3. This version also began the +forwarding of a non-default setting to the remote side, though rsync uses +the backward-compatible options \fB\-\-msgs2stderr\fP and \fB\-\-no-msgs2stderr\fP to +represent the \fBall\fP and \fBclient\fP settings, respectively. A newer rsync +will continue to accept these older option names to maintain compatibility. +.IP "\fB\-\-quiet\fP, \fB\-q\fP" +This option decreases the amount of information you are given during the +transfer, notably suppressing information messages from the remote server. +This option is useful when invoking rsync from cron. +.IP "\fB\-\-no-motd\fP" +This option affects the information that is output by the client at the +start of a daemon transfer. This suppresses the message-of-the-day (MOTD) +text, but it also affects the list of modules that the daemon sends in +response to the "rsync host::" request (due to a limitation in the rsync +protocol), so omit this option if you want to request the list of modules +from the daemon. +.IP "\fB\-\-ignore-times\fP, \fB\-I\fP" +Normally rsync will skip any files that are already the same size and have +the same modification timestamp. This option turns off this "quick check" +behavior, causing all files to be updated. +.IP +This option can be confusing compared to \fB\-\-ignore-existing\fP and +\fB\-\-ignore-non-existing\fP in that that they cause rsync to transfer +fewer files, while this option causes rsync to transfer more files. +.IP "\fB\-\-size-only\fP" +This modifies rsync's "quick check" algorithm for finding files that need +to be transferred, changing it from the default of transferring files with +either a changed size or a changed last-modified time to just looking for +files that have changed in size. This is useful when starting to use rsync +after using another mirroring system which may not preserve timestamps +exactly. +.IP "\fB\-\-modify-window=NUM\fP, \fB\-@\fP" +When comparing two timestamps, rsync treats the timestamps as being equal +if they differ by no more than the modify-window value. The default is 0, +which matches just integer seconds. If you specify a negative value (and +the receiver is at least version 3.1.3) then nanoseconds will also be taken +into account. Specifying 1 is useful for copies to/from MS Windows FAT +filesystems, because FAT represents times with a 2-second resolution +(allowing times to differ from the original by up to 1 second). +.IP +If you want all your transfers to default to comparing nanoseconds, you can +create a \fB~/.popt\fP file and put these lines in it: +.RS 4 +.IP +.nf +rsync alias -a -a@-1 +rsync alias -t -t@-1 +.fi +.RE +.IP +With that as the default, you'd need to specify \fB\-\-modify-window=0\fP (aka +\fB\-@0\fP) to override it and ignore nanoseconds, e.g. if you're copying +between ext3 and ext4, or if the receiving rsync is older than 3.1.3. +.IP "\fB\-\-checksum\fP, \fB\-c\fP" +This changes the way rsync checks if the files have been changed and are in +need of a transfer. Without this option, rsync uses a "quick check" that +(by default) checks if each file's size and time of last modification match +between the sender and receiver. This option changes this to compare a +128-bit checksum for each file that has a matching size. Generating the +checksums means that both sides will expend a lot of disk I/O reading all +the data in the files in the transfer, so this can slow things down +significantly (and this is prior to any reading that will be done to +transfer changed files) +.IP +The sending side generates its checksums while it is doing the file-system +scan that builds the list of the available files. The receiver generates +its checksums when it is scanning for changed files, and will checksum any +file that has the same size as the corresponding sender's file: files with +either a changed size or a changed checksum are selected for transfer. +.IP +Note that rsync always verifies that each \fItransferred\fP file was correctly +reconstructed on the receiving side by checking a whole-file checksum that +is generated as the file is transferred, but that automatic +after-the-transfer verification has nothing to do with this option's +before-the-transfer "Does this file need to be updated?" check. +.IP +The checksum used is auto-negotiated between the client and the server, but +can be overridden using either the \fB\-\-checksum-choice\fP (\fB\-\-cc\fP) +option or an environment variable that is discussed in that option's +section. +.IP "\fB\-\-archive\fP, \fB\-a\fP" +This is equivalent to \fB\-rlptgoD\fP. It is a quick way of saying you want +recursion and want to preserve almost everything. Be aware that it does +\fBnot\fP include preserving ACLs (\fB\-A\fP), xattrs (\fB\-X\fP), atimes (\fB\-U\fP), +crtimes (\fB\-N\fP), nor the finding and preserving of hardlinks (\fB\-H\fP). +.IP +The only exception to the above equivalence is when \fB\-\-files-from\fP +is specified, in which case \fB\-r\fP is not implied. +.IP "\fB\-\-no-OPTION\fP" +You may turn off one or more implied options by prefixing the option name +with "no-". Not all positive options have a negated opposite, but a lot +do, including those that can be used to disable an implied option (e.g. +\fB\-\-no-D\fP, \fB\-\-no-perms\fP) or have different defaults in various circumstances +(e.g. \fB\-\-no-whole-file\fP, \fB\-\-no-blocking-io\fP, \fB\-\-no-dirs\fP). Every +valid negated option accepts both the short and the long option name after +the "no-" prefix (e.g. \fB\-\-no-R\fP is the same as \fB\-\-no-relative\fP). +.IP +As an example, if you want to use \fB\-\-archive\fP (\fB\-a\fP) but don't want +\fB\-\-owner\fP (\fB\-o\fP), instead of converting \fB\-a\fP into \fB\-rlptgD\fP, you +can specify \fB\-a\ \-\-no-o\fP (aka \fB\-\-archive\ \-\-no-owner\fP). +.IP +The order of the options is important: if you specify \fB\-\-no-r\ \-a\fP, the \fB\-r\fP +option would end up being turned on, the opposite of \fB\-a\ \-\-no-r\fP. Note +also that the side-effects of the \fB\-\-files-from\fP option are NOT +positional, as it affects the default state of several options and slightly +changes the meaning of \fB\-a\fP (see the \fB\-\-files-from\fP option +for more details). +.IP "\fB\-\-recursive\fP, \fB\-r\fP" +This tells rsync to copy directories recursively. See also +\fB\-\-dirs\fP (\fB\-d\fP) for an option that allows the scanning of a single +directory. +.IP +See the \fB\-\-inc-recursive\fP option for a discussion of the +incremental recursion for creating the list of files to transfer. +.IP "\fB\-\-inc-recursive\fP, \fB\-\-i-r\fP" +This option explicitly enables on incremental recursion when scanning for +files, which is enabled by default when using the \fB\-\-recursive\fP +option and both sides of the transfer are running rsync 3.0.0 or newer. +.IP +Incremental recursion uses much less memory than non-incremental, while +also beginning the transfer more quickly (since it doesn't need to scan the +entire transfer hierarchy before it starts transferring files). If no +recursion is enabled in the source files, this option has no effect. +.IP +Some options require rsync to know the full file list, so these options +disable the incremental recursion mode. These include: +.IP +.RS +.IP o +\fB\-\-delete-before\fP (the old default of \fB\-\-delete\fP) +.IP o +\fB\-\-delete-after\fP +.IP o +\fB\-\-prune-empty-dirs\fP +.IP o +\fB\-\-delay-updates\fP +.RE +.IP +In order to make \fB\-\-delete\fP compatible with incremental recursion, +rsync 3.0.0 made \fB\-\-delete-during\fP the default delete mode (which +was first added in 2.6.4). +.IP +One side-effect of incremental recursion is that any missing +sub-directories inside a recursively-scanned directory are (by default) +created prior to recursing into the sub-dirs. This earlier creation point +(compared to a non-incremental recursion) allows rsync to then set the +modify time of the finished directory right away (without having to delay +that until a bunch of recursive copying has finished). However, these +early directories don't yet have their completed mode, mtime, or ownership +set\ \-\- they have more restrictive rights until the subdirectory's copying +actually begins. This early-creation idiom can be avoided by using the +\fB\-\-omit-dir-times\fP option. +.IP +Incremental recursion can be disabled using the +\fB\-\-no-inc-recursive\fP (\fB\-\-no-i-r\fP) option. +.IP "\fB\-\-no-inc-recursive\fP, \fB\-\-no-i-r\fP" +Disables the new incremental recursion algorithm of the +\fB\-\-recursive\fP option. This makes rsync scan the full file list +before it begins to transfer files. See \fB\-\-inc-recursive\fP for more +info. +.IP "\fB\-\-relative\fP, \fB\-R\fP" +Use relative paths. This means that the full path names specified on the +command line are sent to the server rather than just the last parts of the +filenames. This is particularly useful when you want to send several +different directories at the same time. For example, if you used this +command: +.RS 4 +.IP +.nf +rsync -av /foo/bar/baz.c remote:/tmp/ +.fi +.RE +.IP +would create a file named baz.c in /tmp/ on the remote machine. If instead +you used +.RS 4 +.IP +.nf +rsync -avR /foo/bar/baz.c remote:/tmp/ +.fi +.RE +.IP +then a file named /tmp/foo/bar/baz.c would be created on the remote +machine, preserving its full path. These extra path elements are called +"implied directories" (i.e. the "foo" and the "foo/bar" directories in the +above example). +.IP +Beginning with rsync 3.0.0, rsync always sends these implied directories as +real directories in the file list, even if a path element is really a +symlink on the sending side. This prevents some really unexpected behaviors +when copying the full path of a file that you didn't realize had a symlink +in its path. If you want to duplicate a server-side symlink, include both +the symlink via its path, and referent directory via its real path. If +you're dealing with an older rsync on the sending side, you may need to use +the \fB\-\-no-implied-dirs\fP option. +.IP +It is also possible to limit the amount of path information that is sent as +implied directories for each path you specify. With a modern rsync on the +sending side (beginning with 2.6.7), you can insert a dot and a slash into +the source path, like this: +.RS 4 +.IP +.nf +rsync -avR /foo/./bar/baz.c remote:/tmp/ +.fi +.RE +.IP +That would create /tmp/bar/baz.c on the remote machine. (Note that the dot +must be followed by a slash, so "/foo/." would not be abbreviated.) For +older rsync versions, you would need to use a chdir to limit the source +path. For example, when pushing files: +.RS 4 +.IP +.nf +(cd /foo; rsync -avR bar/baz.c remote:/tmp/) +.fi +.RE +.IP +(Note that the parens put the two commands into a sub-shell, so that the +"cd" command doesn't remain in effect for future commands.) If you're +pulling files from an older rsync, use this idiom (but only for a +non-daemon transfer): +.RS 4 +.IP +.nf +rsync -avR --rsync-path="cd /foo; rsync" \\ + remote:bar/baz.c /tmp/ +.fi +.RE +.IP "\fB\-\-no-implied-dirs\fP" +This option affects the default behavior of the \fB\-\-relative\fP option. When +it is specified, the attributes of the implied directories from the source +names are not included in the transfer. This means that the corresponding +path elements on the destination system are left unchanged if they exist, +and any missing implied directories are created with default attributes. +This even allows these implied path elements to have big differences, such +as being a symlink to a directory on the receiving side. +.IP +For instance, if a command-line arg or a files-from entry told rsync to +transfer the file "path/foo/file", the directories "path" and "path/foo" +are implied when \fB\-\-relative\fP is used. If "path/foo" is a symlink to "bar" +on the destination system, the receiving rsync would ordinarily delete +"path/foo", recreate it as a directory, and receive the file into the new +directory. With \fB\-\-no-implied-dirs\fP, the receiving rsync updates +"path/foo/file" using the existing path elements, which means that the file +ends up being created in "path/bar". Another way to accomplish this link +preservation is to use the \fB\-\-keep-dirlinks\fP option (which will also affect +symlinks to directories in the rest of the transfer). +.IP +When pulling files from an rsync older than 3.0.0, you may need to use this +option if the sending side has a symlink in the path you request and you +wish the implied directories to be transferred as normal directories. +.IP "\fB\-\-backup\fP, \fB\-b\fP" +With this option, preexisting destination files are renamed as each file is +transferred or deleted. You can control where the backup file goes and +what (if any) suffix gets appended using the \fB\-\-backup-dir\fP and +\fB\-\-suffix\fP options. +.IP +If you don't specify \fB\-\-backup-dir\fP: +.RS +.IP +.IP 1. +the \fB\-\-omit-dir-times\fP option will be forced on +.IP 2. +the use of \fB\-\-delete\fP (without \fB\-\-delete-excluded\fP), +causes rsync to add a "protect" filter-rule for the +backup suffix to the end of all your existing filters that looks like +this: \fB\-f\ "P\ *~"\fP. This rule prevents previously backed-up files from +being deleted. +.RE +.IP +Note that if you are supplying your own filter rules, you may need to +manually insert your own exclude/protect rule somewhere higher up in the +list so that it has a high enough priority to be effective (e.g. if your +rules specify a trailing inclusion/exclusion of \fB*\fP, the auto-added rule +would never be reached). +.IP "\fB\-\-backup-dir=DIR\fP" +This implies the \fB\-\-backup\fP option, and tells rsync to store all +backups in the specified directory on the receiving side. This can be used +for incremental backups. You can additionally specify a backup suffix +using the \fB\-\-suffix\fP option (otherwise the files backed up in the +specified directory will keep their original filenames). +.IP +Note that if you specify a relative path, the backup directory will be +relative to the destination directory, so you probably want to specify +either an absolute path or a path that starts with "../". If an rsync +daemon is the receiver, the backup dir cannot go outside the module's path +hierarchy, so take extra care not to delete it or copy into it. +.IP "\fB\-\-suffix=SUFFIX\fP" +This option allows you to override the default backup suffix used with the +\fB\-\-backup\fP (\fB\-b\fP) option. The default suffix is a \fB~\fP if no +\fB\-\-backup-dir\fP was specified, otherwise it is an empty string. +.IP "\fB\-\-update\fP, \fB\-u\fP" +This forces rsync to skip any files which exist on the destination and have +a modified time that is newer than the source file. (If an existing +destination file has a modification time equal to the source file's, it +will be updated if the sizes are different.) +.IP +Note that this does not affect the copying of dirs, symlinks, or other +special files. Also, a difference of file format between the sender and +receiver is always considered to be important enough for an update, no +matter what date is on the objects. In other words, if the source has a +directory where the destination has a file, the transfer would occur +regardless of the timestamps. +.IP +This option is a TRANSFER RULE, so don't expect any +exclude side effects. +.IP +A caution for those that choose to combine \fB\-\-inplace\fP with +\fB\-\-update\fP: an interrupted transfer will leave behind a partial file on the +receiving side that has a very recent modified time, so re-running the +transfer will probably \fBnot\fP continue the interrupted file. As such, it +is usually best to avoid combining this with \fB\-\-inplace\fP unless you +have implemented manual steps to handle any interrupted in-progress files. +.IP "\fB\-\-inplace\fP" +This option changes how rsync transfers a file when its data needs to be +updated: instead of the default method of creating a new copy of the file +and moving it into place when it is complete, rsync instead writes the +updated data directly to the destination file. +.IP +This has several effects: +.IP +.RS +.IP o +Hard links are not broken. This means the new data will be visible +through other hard links to the destination file. Moreover, attempts to +copy differing source files onto a multiply-linked destination file will +result in a "tug of war" with the destination data changing back and +forth. +.IP o +In-use binaries cannot be updated (either the OS will prevent this from +happening, or binaries that attempt to swap-in their data will misbehave +or crash). +.IP o +The file's data will be in an inconsistent state during the transfer and +will be left that way if the transfer is interrupted or if an update +fails. +.IP o +A file that rsync cannot write to cannot be updated. While a super user +can update any file, a normal user needs to be granted write permission +for the open of the file for writing to be successful. +.IP o +The efficiency of rsync's delta-transfer algorithm may be reduced if some +data in the destination file is overwritten before it can be copied to a +position later in the file. This does not apply if you use \fB\-\-backup\fP, +since rsync is smart enough to use the backup file as the basis file for +the transfer. +.RE +.IP +WARNING: you should not use this option to update files that are being +accessed by others, so be careful when choosing to use this for a copy. +.IP +This option is useful for transferring large files with block-based changes +or appended data, and also on systems that are disk bound, not network +bound. It can also help keep a copy-on-write filesystem snapshot from +diverging the entire contents of a file that only has minor changes. +.IP +The option implies \fB\-\-partial\fP (since an interrupted transfer does +not delete the file), but conflicts with \fB\-\-partial-dir\fP and +\fB\-\-delay-updates\fP. Prior to rsync 2.6.4 \fB\-\-inplace\fP was also +incompatible with \fB\-\-compare-dest\fP and \fB\-\-link-dest\fP. +.IP "\fB\-\-append\fP" +This special copy mode only works to efficiently update files that are +known to be growing larger where any existing content on the receiving side +is also known to be the same as the content on the sender. The use of +\fB\-\-append\fP \fBcan be dangerous\fP if you aren't 100% sure that all the files +in the transfer are shared, growing files. You should thus use filter +rules to ensure that you weed out any files that do not fit this criteria. +.IP +Rsync updates these growing file in-place without verifying any of the +existing content in the file (it only verifies the content that it is +appending). Rsync skips any files that exist on the receiving side that +are not shorter than the associated file on the sending side (which means +that new files are transferred). It also skips any files whose size on the +sending side gets shorter during the send negotiations (rsync warns about a +"diminished" file when this happens). +.IP +This does not interfere with the updating of a file's non-content +attributes (e.g. permissions, ownership, etc.) when the file does not need +to be transferred, nor does it affect the updating of any directories or +non-regular files. +.IP "\fB\-\-append-verify\fP" +This special copy mode works like \fB\-\-append\fP except that all the +data in the file is included in the checksum verification (making it less +efficient but also potentially safer). This option \fBcan be dangerous\fP if +you aren't 100% sure that all the files in the transfer are shared, growing +files. See the \fB\-\-append\fP option for more details. +.IP +Note: prior to rsync 3.0.0, the \fB\-\-append\fP option worked like +\fB\-\-append-verify\fP, so if you are interacting with an older rsync (or the +transfer is using a protocol prior to 30), specifying either append option +will initiate an \fB\-\-append-verify\fP transfer. +.IP "\fB\-\-dirs\fP, \fB\-d\fP" +Tell the sending side to include any directories that are encountered. +Unlike \fB\-\-recursive\fP, a directory's contents are not copied unless +the directory name specified is "." or ends with a trailing slash (e.g. +".", "dir/.", "dir/", etc.). Without this option or the +\fB\-\-recursive\fP option, rsync will skip all directories it encounters +(and output a message to that effect for each one). If you specify both +\fB\-\-dirs\fP and \fB\-\-recursive\fP, \fB\-\-recursive\fP takes precedence. +.IP +The \fB\-\-dirs\fP option is implied by the \fB\-\-files-from\fP option or the +\fB\-\-list-only\fP option (including an implied \fB\-\-list-only\fP +usage) if \fB\-\-recursive\fP wasn't specified (so that directories are +seen in the listing). Specify \fB\-\-no-dirs\fP (or \fB\-\-no-d\fP) if you want to +turn this off. +.IP +There is also a backward-compatibility helper option, \fB\-\-old-dirs\fP +(\fB\-\-old-d\fP) that tells rsync to use a hack of \fB\-r\ \-\-exclude='/*/*'\fP to get +an older rsync to list a single directory without recursing. +.IP "\fB\-\-mkpath\fP" +Create all missing path components of the destination path. +.IP +By default, rsync allows only the final component of the destination path +to not exist, which is an attempt to help you to validate your destination +path. With this option, rsync creates all the missing destination-path +components, just as if \fBmkdir\ \-p\ $DEST_PATH\fP had been run on the receiving +side. +.IP +When specifying a destination path, including a trailing slash ensures that +the whole path is treated as directory names to be created, even when the +file list has a single item. See the COPYING TO A DIFFERENT NAME +section for full details on how rsync decides if a final destination-path +component should be created as a directory or not. +.IP +If you would like the newly-created destination dirs to match the dirs on +the sending side, you should be using \fB\-\-relative\fP (\fB\-R\fP) instead +of \fB\-\-mkpath\fP. For instance, the following two commands result in the same +destination tree, but only the second command ensures that the +"some/extra/path" components match the dirs on the sending side: +.RS 4 +.IP +.nf +rsync -ai --mkpath host:some/extra/path/*.c some/extra/path/ +rsync -aiR host:some/extra/path/*.c ./ +.fi +.RE +.IP "\fB\-\-links\fP, \fB\-l\fP" +Add symlinks to the transferred files instead of noisily ignoring them with +a "non-regular file" warning for each symlink encountered. You can +alternately silence the warning by specifying \fB\-\-info=nonreg0\fP. +.IP +The default handling of symlinks is to recreate each symlink's unchanged +value on the receiving side. +.IP +See the SYMBOLIC LINKS section for multi-option info. +.IP "\fB\-\-copy-links\fP, \fB\-L\fP" +The sender transforms each symlink encountered in the transfer into the +referent item, following the symlink chain to the file or directory that it +references. If a symlink chain is broken, an error is output and the file +is dropped from the transfer. +.IP +This option supersedes any other options that affect symlinks in the +transfer, since there are no symlinks left in the transfer. +.IP +This option does not change the handling of existing symlinks on the +receiving side, unlike versions of rsync prior to 2.6.3 which had the +side-effect of telling the receiving side to also follow symlinks. A +modern rsync won't forward this option to a remote receiver (since only the +sender needs to know about it), so this caveat should only affect someone +using an rsync client older than 2.6.7 (which is when \fB\-L\fP stopped being +forwarded to the receiver). +.IP +See the \fB\-\-keep-dirlinks\fP (\fB\-K\fP) if you need a symlink to a +directory to be treated as a real directory on the receiving side. +.IP +See the SYMBOLIC LINKS section for multi-option info. +.IP "\fB\-\-copy-unsafe-links\fP" +This tells rsync to copy the referent of symbolic links that point outside +the copied tree. Absolute symlinks are also treated like ordinary files, +and so are any symlinks in the source path itself when \fB\-\-relative\fP +is used. +.IP +Note that the cut-off point is the top of the transfer, which is the part +of the path that rsync isn't mentioning in the verbose output. If you copy +"/src/subdir" to "/dest/" then the "subdir" directory is a name inside the +transfer tree, not the top of the transfer (which is /src) so it is legal +for created relative symlinks to refer to other names inside the /src and +/dest directories. If you instead copy "/src/subdir/" (with a trailing +slash) to "/dest/subdir" that would not allow symlinks to any files outside +of "subdir". +.IP +Note that safe symlinks are only copied if \fB\-\-links\fP was also +specified or implied. The \fB\-\-copy-unsafe-links\fP option has no extra effect +when combined with \fB\-\-copy-links\fP. +.IP +See the SYMBOLIC LINKS section for multi-option info. +.IP "\fB\-\-safe-links\fP" +This tells the receiving rsync to ignore any symbolic links in the transfer +which point outside the copied tree. All absolute symlinks are also +ignored. +.IP +Since this ignoring is happening on the receiving side, it will still be +effective even when the sending side has munged symlinks (when it is using +\fB\-\-munge-links\fP). It also affects deletions, since the file being +present in the transfer prevents any matching file on the receiver from +being deleted when the symlink is deemed to be unsafe and is skipped. +.IP +This option must be combined with \fB\-\-links\fP (or +\fB\-\-archive\fP) to have any symlinks in the transfer to conditionally +ignore. Its effect is superseded by \fB\-\-copy-unsafe-links\fP. +.IP +Using this option in conjunction with \fB\-\-relative\fP may give +unexpected results. +.IP +See the SYMBOLIC LINKS section for multi-option info. +.IP "\fB\-\-munge-links\fP" +This option affects just one side of the transfer and tells rsync to munge +symlink values when it is receiving files or unmunge symlink values when it +is sending files. The munged values make the symlinks unusable on disk but +allows the original contents of the symlinks to be recovered. +.IP +The server-side rsync often enables this option without the client's +knowledge, such as in an rsync daemon's configuration file or by an option +given to the rrsync (restricted rsync) script. When specified on the +client side, specify the option normally if it is the client side that +has/needs the munged symlinks, or use \fB\-M\-\-munge-links\fP to give the option +to the server when it has/needs the munged symlinks. Note that on a local +transfer, the client is the sender, so specifying the option directly +unmunges symlinks while specifying it as a remote option munges symlinks. +.IP +This option has no effect when sent to a daemon via \fB\-\-remote-option\fP +because the daemon configures whether it wants munged symlinks via its +"\fBmunge\ symlinks\fP" parameter. +.IP +The symlink value is munged/unmunged once it is in the transfer, so any +option that transforms symlinks into non-symlinks occurs prior to the +munging/unmunging \fBexcept\fP for \fB\-\-safe-links\fP, which is a choice +that the receiver makes, so it bases its decision on the munged/unmunged +value. This does mean that if a receiver has munging enabled, that using +\fB\-\-safe-links\fP will cause all symlinks to be ignored (since they +are all absolute). +.IP +The method that rsync uses to munge the symlinks is to prefix each one's +value with the string "/rsyncd-munged/". This prevents the links from +being used as long as the directory does not exist. When this option is +enabled, rsync will refuse to run if that path is a directory or a symlink +to a directory (though it only checks at startup). See also the +"munge-symlinks" python script in the support directory of the source code +for a way to munge/unmunge one or more symlinks in-place. +.IP "\fB\-\-copy-dirlinks\fP, \fB\-k\fP" +This option causes the sending side to treat a symlink to a directory as +though it were a real directory. This is useful if you don't want symlinks +to non-directories to be affected, as they would be using +\fB\-\-copy-links\fP. +.IP +Without this option, if the sending side has replaced a directory with a +symlink to a directory, the receiving side will delete anything that is in +the way of the new symlink, including a directory hierarchy (as long as +\fB\-\-force\fP or \fB\-\-delete\fP is in effect). +.IP +See also \fB\-\-keep-dirlinks\fP for an analogous option for the +receiving side. +.IP +\fB\-\-copy-dirlinks\fP applies to all symlinks to directories in the source. If +you want to follow only a few specified symlinks, a trick you can use is to +pass them as additional source args with a trailing slash, using +\fB\-\-relative\fP to make the paths match up right. For example: +.RS 4 +.IP +.nf +rsync -r --relative src/./ src/./follow-me/ dest/ +.fi +.RE +.IP +This works because rsync calls \fBlstat\fP(2) on the source arg as given, and +the trailing slash makes \fBlstat\fP(2) follow the symlink, giving rise to a +directory in the file-list which overrides the symlink found during the +scan of "src/./". +.IP +See the SYMBOLIC LINKS section for multi-option info. +.IP "\fB\-\-keep-dirlinks\fP, \fB\-K\fP" +This option causes the receiving side to treat a symlink to a directory as +though it were a real directory, but only if it matches a real directory +from the sender. Without this option, the receiver's symlink would be +deleted and replaced with a real directory. +.IP +For example, suppose you transfer a directory "foo" that contains a file +"file", but "foo" is a symlink to directory "bar" on the receiver. Without +\fB\-\-keep-dirlinks\fP, the receiver deletes symlink "foo", recreates it as a +directory, and receives the file into the new directory. With +\fB\-\-keep-dirlinks\fP, the receiver keeps the symlink and "file" ends up in +"bar". +.IP +One note of caution: if you use \fB\-\-keep-dirlinks\fP, you must trust all the +symlinks in the copy or enable the \fB\-\-munge-links\fP option on the +receiving side! If it is possible for an untrusted user to create their +own symlink to any real directory, the user could then (on a subsequent +copy) replace the symlink with a real directory and affect the content of +whatever directory the symlink references. For backup copies, you are +better off using something like a bind mount instead of a symlink to modify +your receiving hierarchy. +.IP +See also \fB\-\-copy-dirlinks\fP for an analogous option for the sending +side. +.IP +See the SYMBOLIC LINKS section for multi-option info. +.IP "\fB\-\-hard-links\fP, \fB\-H\fP" +This tells rsync to look for hard-linked files in the source and link +together the corresponding files on the destination. Without this option, +hard-linked files in the source are treated as though they were separate +files. +.IP +This option does NOT necessarily ensure that the pattern of hard links on +the destination exactly matches that on the source. Cases in which the +destination may end up with extra hard links include the following: +.IP +.RS +.IP o +If the destination contains extraneous hard-links (more linking than what +is present in the source file list), the copying algorithm will not break +them explicitly. However, if one or more of the paths have content +differences, the normal file-update process will break those extra links +(unless you are using the \fB\-\-inplace\fP option). +.IP o +If you specify a \fB\-\-link-dest\fP directory that contains hard +links, the linking of the destination files against the +\fB\-\-link-dest\fP files can cause some paths in the destination to +become linked together due to the \fB\-\-link-dest\fP associations. +.RE +.IP +Note that rsync can only detect hard links between files that are inside +the transfer set. If rsync updates a file that has extra hard-link +connections to files outside the transfer, that linkage will be broken. If +you are tempted to use the \fB\-\-inplace\fP option to avoid this breakage, be +very careful that you know how your files are being updated so that you are +certain that no unintended changes happen due to lingering hard links (and +see the \fB\-\-inplace\fP option for more caveats). +.IP +If incremental recursion is active (see \fB\-\-inc-recursive\fP), rsync +may transfer a missing hard-linked file before it finds that another link +for that contents exists elsewhere in the hierarchy. This does not affect +the accuracy of the transfer (i.e. which files are hard-linked together), +just its efficiency (i.e. copying the data for a new, early copy of a +hard-linked file that could have been found later in the transfer in +another member of the hard-linked set of files). One way to avoid this +inefficiency is to disable incremental recursion using the +\fB\-\-no-inc-recursive\fP option. +.IP "\fB\-\-perms\fP, \fB\-p\fP" +This option causes the receiving rsync to set the destination permissions +to be the same as the source permissions. (See also the \fB\-\-chmod\fP +option for a way to modify what rsync considers to be the source +permissions.) +.IP +When this option is \fIoff\fP, permissions are set as follows: +.IP +.RS +.IP o +Existing files (including updated files) retain their existing +permissions, though the \fB\-\-executability\fP option might change +just the execute permission for the file. +.IP o +New files get their "normal" permission bits set to the source file's +permissions masked with the receiving directory's default permissions +(either the receiving process's umask, or the permissions specified via +the destination directory's default ACL), and their special permission +bits disabled except in the case where a new directory inherits a setgid +bit from its parent directory. +.RE +.IP +Thus, when \fB\-\-perms\fP and \fB\-\-executability\fP are both disabled, rsync's +behavior is the same as that of other file-copy utilities, such as \fBcp\fP(1) +and \fBtar\fP(1). +.IP +In summary: to give destination files (both old and new) the source +permissions, use \fB\-\-perms\fP. To give new files the destination-default +permissions (while leaving existing files unchanged), make sure that the +\fB\-\-perms\fP option is off and use \fB\-\-chmod=ugo=rwX\fP (which ensures +that all non-masked bits get enabled). If you'd care to make this latter +behavior easier to type, you could define a popt alias for it, such as +putting this line in the file \fB~/.popt\fP (the following defines the \fB\-Z\fP +option, and includes \fB\-\-no-g\fP to use the default group of the destination +dir): +.RS 4 +.IP +.nf +rsync alias -Z --no-p --no-g --chmod=ugo=rwX +.fi +.RE +.IP +You could then use this new option in a command such as this one: +.RS 4 +.IP +.nf +rsync -avZ src/ dest/ +.fi +.RE +.IP +(Caveat: make sure that \fB\-a\fP does not follow \fB\-Z\fP, or it will re-enable the +two \fB\-\-no-*\fP options mentioned above.) +.IP +The preservation of the destination's setgid bit on newly-created +directories when \fB\-\-perms\fP is off was added in rsync 2.6.7. Older rsync +versions erroneously preserved the three special permission bits for +newly-created files when \fB\-\-perms\fP was off, while overriding the +destination's setgid bit setting on a newly-created directory. Default ACL +observance was added to the ACL patch for rsync 2.6.7, so older (or +non-ACL-enabled) rsyncs use the umask even if default ACLs are present. +(Keep in mind that it is the version of the receiving rsync that affects +these behaviors.) +.IP "\fB\-\-executability\fP, \fB\-E\fP" +This option causes rsync to preserve the executability (or +non-executability) of regular files when \fB\-\-perms\fP is not enabled. +A regular file is considered to be executable if at least one 'x' is turned +on in its permissions. When an existing destination file's executability +differs from that of the corresponding source file, rsync modifies the +destination file's permissions as follows: +.IP +.RS +.IP o +To make a file non-executable, rsync turns off all its 'x' permissions. +.IP o +To make a file executable, rsync turns on each 'x' permission that has a +corresponding 'r' permission enabled. +.RE +.IP +If \fB\-\-perms\fP is enabled, this option is ignored. +.IP "\fB\-\-acls\fP, \fB\-A\fP" +This option causes rsync to update the destination ACLs to be the same as +the source ACLs. The option also implies \fB\-\-perms\fP. +.IP +The source and destination systems must have compatible ACL entries for +this option to work properly. See the \fB\-\-fake-super\fP option for a +way to backup and restore ACLs that are not compatible. +.IP "\fB\-\-xattrs\fP, \fB\-X\fP" +This option causes rsync to update the destination extended attributes to +be the same as the source ones. +.IP +For systems that support extended-attribute namespaces, a copy being done +by a super-user copies all namespaces except system.*. A normal user only +copies the user.* namespace. To be able to backup and restore non-user +namespaces as a normal user, see the \fB\-\-fake-super\fP option. +.IP +The above name filtering can be overridden by using one or more filter +options with the \fBx\fP modifier. When you specify an xattr-affecting +filter rule, rsync requires that you do your own system/user filtering, as +well as any additional filtering for what xattr names are copied and what +names are allowed to be deleted. For example, to skip the system +namespace, you could specify: +.RS 4 +.IP +.nf +--filter='-x system.*' +.fi +.RE +.IP +To skip all namespaces except the user namespace, you could specify a +negated-user match: +.RS 4 +.IP +.nf +--filter='-x! user.*' +.fi +.RE +.IP +To prevent any attributes from being deleted, you could specify a +receiver-only rule that excludes all names: +.RS 4 +.IP +.nf +--filter='-xr *' +.fi +.RE +.IP +Note that the \fB\-X\fP option does not copy rsync's special xattr values (e.g. +those used by \fB\-\-fake-super\fP) unless you repeat the option (e.g. \fB\-XX\fP). +This "copy all xattrs" mode cannot be used with \fB\-\-fake-super\fP. +.IP "\fB\-\-chmod=CHMOD\fP" +This option tells rsync to apply one or more comma-separated "chmod" modes +to the permission of the files in the transfer. The resulting value is +treated as though it were the permissions that the sending side supplied +for the file, which means that this option can seem to have no effect on +existing files if \fB\-\-perms\fP is not enabled. +.IP +In addition to the normal parsing rules specified in the \fBchmod\fP(1) +manpage, you can specify an item that should only apply to a directory by +prefixing it with a 'D', or specify an item that should only apply to a +file by prefixing it with a 'F'. For example, the following will ensure +that all directories get marked set-gid, that no files are other-writable, +that both are user-writable and group-writable, and that both have +consistent executability across all bits: +.RS 4 +.IP +.nf +--chmod=Dg+s,ug+w,Fo-w,+X +.fi +.RE +.IP +Using octal mode numbers is also allowed: +.RS 4 +.IP +.nf +--chmod=D2775,F664 +.fi +.RE +.IP +It is also legal to specify multiple \fB\-\-chmod\fP options, as each additional +option is just appended to the list of changes to make. +.IP +See the \fB\-\-perms\fP and \fB\-\-executability\fP options for how the +resulting permission value can be applied to the files in the transfer. +.IP "\fB\-\-owner\fP, \fB\-o\fP" +This option causes rsync to set the owner of the destination file to be the +same as the source file, but only if the receiving rsync is being run as +the super-user (see also the \fB\-\-super\fP and \fB\-\-fake-super\fP +options). Without this option, the owner of new and/or transferred files +are set to the invoking user on the receiving side. +.IP +The preservation of ownership will associate matching names by default, but +may fall back to using the ID number in some circumstances (see also the +\fB\-\-numeric-ids\fP option for a full discussion). +.IP "\fB\-\-group\fP, \fB\-g\fP" +This option causes rsync to set the group of the destination file to be the +same as the source file. If the receiving program is not running as the +super-user (or if \fB\-\-no-super\fP was specified), only groups that the +invoking user on the receiving side is a member of will be preserved. +Without this option, the group is set to the default group of the invoking +user on the receiving side. +.IP +The preservation of group information will associate matching names by +default, but may fall back to using the ID number in some circumstances +(see also the \fB\-\-numeric-ids\fP option for a full discussion). +.IP "\fB\-\-devices\fP" +This option causes rsync to transfer character and block device files to +the remote system to recreate these devices. If the receiving rsync is not +being run as the super-user, rsync silently skips creating the device files +(see also the \fB\-\-super\fP and \fB\-\-fake-super\fP options). +.IP +By default, rsync generates a "non-regular file" warning for each device +file encountered when this option is not set. You can silence the warning +by specifying \fB\-\-info=nonreg0\fP. +.IP "\fB\-\-specials\fP" +This option causes rsync to transfer special files, such as named sockets +and fifos. If the receiving rsync is not being run as the super-user, +rsync silently skips creating the special files (see also the +\fB\-\-super\fP and \fB\-\-fake-super\fP options). +.IP +By default, rsync generates a "non-regular file" warning for each special +file encountered when this option is not set. You can silence the warning +by specifying \fB\-\-info=nonreg0\fP. +.IP "\fB\-D\fP" +The \fB\-D\fP option is equivalent to "\fB\-\-devices\fP +\fB\-\-specials\fP". +.IP "\fB\-\-copy-devices\fP" +This tells rsync to treat a device on the sending side as a regular file, +allowing it to be copied to a normal destination file (or another device +if \fB\-\-write-devices\fP was also specified). +.IP +This option is refused by default by an rsync daemon. +.IP "\fB\-\-write-devices\fP" +This tells rsync to treat a device on the receiving side as a regular file, +allowing the writing of file data into a device. +.IP +This option implies the \fB\-\-inplace\fP option. +.IP +Be careful using this, as you should know what devices are present on the +receiving side of the transfer, especially when running rsync as root. +.IP +This option is refused by default by an rsync daemon. +.IP "\fB\-\-times\fP, \fB\-t\fP" +This tells rsync to transfer modification times along with the files and +update them on the remote system. Note that if this option is not used, +the optimization that excludes files that have not been modified cannot be +effective; in other words, a missing \fB\-t\fP (or \fB\-a\fP) will cause the +next transfer to behave as if it used \fB\-\-ignore-times\fP (\fB\-I\fP), +causing all files to be updated (though rsync's delta-transfer algorithm +will make the update fairly efficient if the files haven't actually +changed, you're much better off using \fB\-t\fP). +.IP +A modern rsync that is using transfer protocol 30 or 31 conveys a modify +time using up to 8-bytes. If rsync is forced to speak an older protocol +(perhaps due to the remote rsync being older than 3.0.0) a modify time is +conveyed using 4-bytes. Prior to 3.2.7, these shorter values could convey +a date range of 13-Dec-1901 to 19-Jan-2038. Beginning with 3.2.7, these +4-byte values now convey a date range of 1-Jan-1970 to 7-Feb-2106. If you +have files dated older than 1970, make sure your rsync executables are +upgraded so that the full range of dates can be conveyed. +.IP "\fB\-\-atimes\fP, \fB\-U\fP" +This tells rsync to set the access (use) times of the destination files to +the same value as the source files. +.IP +If repeated, it also sets the \fB\-\-open-noatime\fP option, which can help you +to make the sending and receiving systems have the same access times on the +transferred files without needing to run rsync an extra time after a file +is transferred. +.IP +Note that some older rsync versions (prior to 3.2.0) may have been built +with a pre-release \fB\-\-atimes\fP patch that does not imply +\fB\-\-open-noatime\fP when this option is repeated. +.IP "\fB\-\-open-noatime\fP" +This tells rsync to open files with the O_NOATIME flag (on systems that +support it) to avoid changing the access time of the files that are being +transferred. If your OS does not support the O_NOATIME flag then rsync +will silently ignore this option. Note also that some filesystems are +mounted to avoid updating the atime on read access even without the +O_NOATIME flag being set. +.IP "\fB\-\-crtimes\fP, \fB\-N,\fP" +This tells rsync to set the create times (newness) of the destination +files to the same value as the source files. +.IP "\fB\-\-omit-dir-times\fP, \fB\-O\fP" +This tells rsync to omit directories when it is preserving modification, +access, and create times. If NFS is sharing the directories on the receiving +side, it is a good idea to use \fB\-O\fP. This option is inferred if you use +\fB\-\-backup\fP without \fB\-\-backup-dir\fP. +.IP +This option also has the side-effect of avoiding early creation of missing +sub-directories when incremental recursion is enabled, as discussed in the +\fB\-\-inc-recursive\fP section. +.IP "\fB\-\-omit-link-times\fP, \fB\-J\fP" +This tells rsync to omit symlinks when it is preserving modification, +access, and create times. +.IP "\fB\-\-super\fP" +This tells the receiving side to attempt super-user activities even if the +receiving rsync wasn't run by the super-user. These activities include: +preserving users via the \fB\-\-owner\fP option, preserving all groups +(not just the current user's groups) via the \fB\-\-group\fP option, and +copying devices via the \fB\-\-devices\fP option. This is useful for +systems that allow such activities without being the super-user, and also +for ensuring that you will get errors if the receiving side isn't being run +as the super-user. To turn off super-user activities, the super-user can +use \fB\-\-no-super\fP. +.IP "\fB\-\-fake-super\fP" +When this option is enabled, rsync simulates super-user activities by +saving/restoring the privileged attributes via special extended attributes +that are attached to each file (as needed). This includes the file's owner +and group (if it is not the default), the file's device info (device & +special files are created as empty text files), and any permission bits +that we won't allow to be set on the real file (e.g. the real file gets +u-s,g-s,o-t for safety) or that would limit the owner's access (since the +real super-user can always access/change a file, the files we create can +always be accessed/changed by the creating user). This option also handles +ACLs (if \fB\-\-acls\fP was specified) and non-user extended attributes +(if \fB\-\-xattrs\fP was specified). +.IP +This is a good way to backup data without using a super-user, and to store +ACLs from incompatible systems. +.IP +The \fB\-\-fake-super\fP option only affects the side where the option is used. +To affect the remote side of a remote-shell connection, use the +\fB\-\-remote-option\fP (\fB\-M\fP) option: +.RS 4 +.IP +.nf +rsync -av -M--fake-super /src/ host:/dest/ +.fi +.RE +.IP +For a local copy, this option affects both the source and the destination. +If you wish a local copy to enable this option just for the destination +files, specify \fB\-M\-\-fake-super\fP. If you wish a local copy to enable this +option just for the source files, combine \fB\-\-fake-super\fP with \fB\-M\-\-super\fP. +.IP +This option is overridden by both \fB\-\-super\fP and \fB\-\-no-super\fP. +.IP +See also the \fBfake\ super\fP setting in the +daemon's rsyncd.conf file. +.IP "\fB\-\-sparse\fP, \fB\-S\fP" +Try to handle sparse files efficiently so they take up less space on the +destination. If combined with \fB\-\-inplace\fP the file created might +not end up with sparse blocks with some combinations of kernel version +and/or filesystem type. If \fB\-\-whole-file\fP is in effect (e.g. for a +local copy) then it will always work because rsync truncates the file prior +to writing out the updated version. +.IP +Note that versions of rsync older than 3.1.3 will reject the combination of +\fB\-\-sparse\fP and \fB\-\-inplace\fP. +.IP "\fB\-\-preallocate\fP" +This tells the receiver to allocate each destination file to its eventual +size before writing data to the file. Rsync will only use the real +filesystem-level preallocation support provided by Linux's \fBfallocate\fP(2) +system call or Cygwin's \fBposix_fallocate\fP(3), not the slow glibc +implementation that writes a null byte into each block. +.IP +Without this option, larger files may not be entirely contiguous on the +filesystem, but with this option rsync will probably copy more slowly. If +the destination is not an extent-supporting filesystem (such as ext4, xfs, +NTFS, etc.), this option may have no positive effect at all. +.IP +If combined with \fB\-\-sparse\fP, the file will only have sparse blocks +(as opposed to allocated sequences of null bytes) if the kernel version and +filesystem type support creating holes in the allocated data. +.IP "\fB\-\-dry-run\fP, \fB\-n\fP" +This makes rsync perform a trial run that doesn't make any changes (and +produces mostly the same output as a real run). It is most commonly used +in combination with the \fB\-\-verbose\fP (\fB\-v\fP) and/or +\fB\-\-itemize-changes\fP (\fB\-i\fP) options to see what an rsync command is +going to do before one actually runs it. +.IP +The output of \fB\-\-itemize-changes\fP is supposed to be exactly the +same on a dry run and a subsequent real run (barring intentional trickery +and system call failures); if it isn't, that's a bug. Other output should +be mostly unchanged, but may differ in some areas. Notably, a dry run does +not send the actual data for file transfers, so \fB\-\-progress\fP has no +effect, the "bytes sent", "bytes received", "literal data", and "matched +data" statistics are too small, and the "speedup" value is equivalent to a +run where no file transfers were needed. +.IP "\fB\-\-whole-file\fP, \fB\-W\fP" +This option disables rsync's delta-transfer algorithm, which causes all +transferred files to be sent whole. The transfer may be faster if this +option is used when the bandwidth between the source and destination +machines is higher than the bandwidth to disk (especially when the "disk" +is actually a networked filesystem). This is the default when both the +source and destination are specified as local paths, but only if no +batch-writing option is in effect. +.IP "\fB\-\-no-whole-file\fP, \fB\-\-no-W\fP" +Disable whole-file updating when it is enabled by default for a local +transfer. This usually slows rsync down, but it can be useful if you are +trying to minimize the writes to the destination file (if combined with +\fB\-\-inplace\fP) or for testing the checksum-based update algorithm. +.IP +See also the \fB\-\-whole-file\fP option. +.IP "\fB\-\-checksum-choice=STR\fP, \fB\-\-cc=STR\fP" +This option overrides the checksum algorithms. If one algorithm name is +specified, it is used for both the transfer checksums and (assuming +\fB\-\-checksum\fP is specified) the pre-transfer checksums. If two +comma-separated names are supplied, the first name affects the transfer +checksums, and the second name affects the pre-transfer checksums (\fB\-c\fP). +.IP +The checksum options that you may be able to use are: +.IP +.RS +.IP o +\fBauto\fP (the default automatic choice) +.IP o +\fBxxh128\fP +.IP o +\fBxxh3\fP +.IP o +\fBxxh64\fP (aka \fBxxhash\fP) +.IP o +\fBmd5\fP +.IP o +\fBmd4\fP +.IP o +\fBsha1\fP +.IP o +\fBnone\fP +.RE +.IP +Run \fBrsync\ \-\-version\fP to see the default checksum list compiled into your +version (which may differ from the list above). +.IP +If "none" is specified for the first (or only) name, the \fB\-\-whole-file\fP +option is forced on and no checksum verification is performed on the +transferred data. If "none" is specified for the second (or only) name, +the \fB\-\-checksum\fP option cannot be used. +.IP +The "auto" option is the default, where rsync bases its algorithm choice on +a negotiation between the client and the server as follows: +.IP +When both sides of the transfer are at least 3.2.0, rsync chooses the first +algorithm in the client's list of choices that is also in the server's list +of choices. If no common checksum choice is found, rsync exits with +an error. If the remote rsync is too old to support checksum negotiation, +a value is chosen based on the protocol version (which chooses between MD5 +and various flavors of MD4 based on protocol age). +.IP +The default order can be customized by setting the environment variable +\fBRSYNC_CHECKSUM_LIST\fP to a space-separated list of acceptable checksum +names. If the string contains a "\fB&\fP" character, it is separated into the +"client string & server string", otherwise the same string applies to both. +If the string (or string portion) contains no non-whitespace characters, +the default checksum list is used. This method does not allow you to +specify the transfer checksum separately from the pre-transfer checksum, +and it discards "auto" and all unknown checksum names. A list with only +invalid names results in a failed negotiation. +.IP +The use of the \fB\-\-checksum-choice\fP option overrides this environment list. +.IP "\fB\-\-one-file-system\fP, \fB\-x\fP" +This tells rsync to avoid crossing a filesystem boundary when recursing. +This does not limit the user's ability to specify items to copy from +multiple filesystems, just rsync's recursion through the hierarchy of each +directory that the user specified, and also the analogous recursion on the +receiving side during deletion. Also keep in mind that rsync treats a +"bind" mount to the same device as being on the same filesystem. +.IP +If this option is repeated, rsync omits all mount-point directories from +the copy. Otherwise, it includes an empty directory at each mount-point it +encounters (using the attributes of the mounted directory because those of +the underlying mount-point directory are inaccessible). +.IP +If rsync has been told to collapse symlinks (via \fB\-\-copy-links\fP or +\fB\-\-copy-unsafe-links\fP), a symlink to a directory on another device +is treated like a mount-point. Symlinks to non-directories are unaffected +by this option. +.IP "\fB\-\-ignore-non-existing\fP, \fB\-\-existing\fP" +This tells rsync to skip creating files (including directories) that do not +exist yet on the destination. If this option is combined with the +\fB\-\-ignore-existing\fP option, no files will be updated (which can be +useful if all you want to do is delete extraneous files). +.IP +This option is a TRANSFER RULE, so don't expect any +exclude side effects. +.IP "\fB\-\-ignore-existing\fP" +This tells rsync to skip updating files that already exist on the +destination (this does \fInot\fP ignore existing directories, or nothing would +get done). See also \fB\-\-ignore-non-existing\fP. +.IP +This option is a TRANSFER RULE, so don't expect any +exclude side effects. +.IP +This option can be useful for those doing backups using the +\fB\-\-link-dest\fP option when they need to continue a backup run that +got interrupted. Since a \fB\-\-link-dest\fP run is copied into a new +directory hierarchy (when it is used properly), using [\fB\-\-ignore-existing\fP +will ensure that the already-handled files don't get tweaked (which avoids +a change in permissions on the hard-linked files). This does mean that +this option is only looking at the existing files in the destination +hierarchy itself. +.IP +When \fB\-\-info=skip2\fP is used rsync will output "FILENAME exists +(INFO)" messages where the INFO indicates one of "type change", "sum +change" (requires \fB\-c\fP), "file change" (based on the quick check), +"attr change", or "uptodate". Using \fB\-\-info=skip1\fP (which is also +implied by 2 \fB\-v\fP options) outputs the exists message without the +INFO suffix. +.IP "\fB\-\-remove-source-files\fP" +This tells rsync to remove from the sending side the files (meaning +non-directories) that are a part of the transfer and have been successfully +duplicated on the receiving side. +.IP +Note that you should only use this option on source files that are +quiescent. If you are using this to move files that show up in a +particular directory over to another host, make sure that the finished +files get renamed into the source directory, not directly written into it, +so that rsync can't possibly transfer a file that is not yet fully written. +If you can't first write the files into a different directory, you should +use a naming idiom that lets rsync avoid transferring files that are not +yet finished (e.g. name the file "foo.new" when it is written, rename it to +"foo" when it is done, and then use the option \fB\-\-exclude='*.new'\fP +for the rsync transfer). +.IP +Starting with 3.1.0, rsync will skip the sender-side removal (and output an +error) if the file's size or modify time has not stayed unchanged. +.IP +Starting with 3.2.6, a local rsync copy will ensure that the sender does +not remove a file the receiver just verified, such as when the user +accidentally makes the source and destination directory the same path. +.IP "\fB\-\-delete\fP" +This tells rsync to delete extraneous files from the receiving side (ones +that aren't on the sending side), but only for the directories that are +being synchronized. You must have asked rsync to send the whole directory +(e.g. "\fBdir\fP" or "\fBdir/\fP") without using a wildcard for the directory's +contents (e.g. "\fBdir/*\fP") since the wildcard is expanded by the shell and +rsync thus gets a request to transfer individual files, not the files' +parent directory. Files that are excluded from the transfer are also +excluded from being deleted unless you use the \fB\-\-delete-excluded\fP +option or mark the rules as only matching on the sending side (see the +include/exclude modifiers in the FILTER RULES section). +.IP +Prior to rsync 2.6.7, this option would have no effect unless +\fB\-\-recursive\fP was enabled. Beginning with 2.6.7, deletions will +also occur when \fB\-\-dirs\fP (\fB\-d\fP) is enabled, but only for +directories whose contents are being copied. +.IP +This option can be dangerous if used incorrectly! It is a very good idea to +first try a run using the \fB\-\-dry-run\fP (\fB\-n\fP) option to see what +files are going to be deleted. +.IP +If the sending side detects any I/O errors, then the deletion of any files +at the destination will be automatically disabled. This is to prevent +temporary filesystem failures (such as NFS errors) on the sending side from +causing a massive deletion of files on the destination. You can override +this with the \fB\-\-ignore-errors\fP option. +.IP +The \fB\-\-delete\fP option may be combined with one of the \-\-delete-WHEN options +without conflict, as well as \fB\-\-delete-excluded\fP. However, if none +of the \fB\-\-delete-WHEN\fP options are specified, rsync will choose the +\fB\-\-delete-during\fP algorithm when talking to rsync 3.0.0 or newer, +or the \fB\-\-delete-before\fP algorithm when talking to an older rsync. +See also \fB\-\-delete-delay\fP and \fB\-\-delete-after\fP. +.IP "\fB\-\-delete-before\fP" +Request that the file-deletions on the receiving side be done before the +transfer starts. See \fB\-\-delete\fP (which is implied) for more +details on file-deletion. +.IP +Deleting before the transfer is helpful if the filesystem is tight for +space and removing extraneous files would help to make the transfer +possible. However, it does introduce a delay before the start of the +transfer, and this delay might cause the transfer to timeout (if +\fB\-\-timeout\fP was specified). It also forces rsync to use the old, +non-incremental recursion algorithm that requires rsync to scan all the +files in the transfer into memory at once (see \fB\-\-recursive\fP). +.IP "\fB\-\-delete-during\fP, \fB\-\-del\fP" +Request that the file-deletions on the receiving side be done incrementally +as the transfer happens. The per-directory delete scan is done right +before each directory is checked for updates, so it behaves like a more +efficient \fB\-\-delete-before\fP, including doing the deletions prior to +any per-directory filter files being updated. This option was first added +in rsync version 2.6.4. See \fB\-\-delete\fP (which is implied) for more +details on file-deletion. +.IP "\fB\-\-delete-delay\fP" +Request that the file-deletions on the receiving side be computed during +the transfer (like \fB\-\-delete-during\fP), and then removed after the +transfer completes. This is useful when combined with +\fB\-\-delay-updates\fP and/or \fB\-\-fuzzy\fP, and is more efficient +than using \fB\-\-delete-after\fP (but can behave differently, since +\fB\-\-delete-after\fP computes the deletions in a separate pass after +all updates are done). If the number of removed files overflows an +internal buffer, a temporary file will be created on the receiving side to +hold the names (it is removed while open, so you shouldn't see it during +the transfer). If the creation of the temporary file fails, rsync will try +to fall back to using \fB\-\-delete-after\fP (which it cannot do if +\fB\-\-recursive\fP is doing an incremental scan). See +\fB\-\-delete\fP (which is implied) for more details on file-deletion. +.IP "\fB\-\-delete-after\fP" +Request that the file-deletions on the receiving side be done after the +transfer has completed. This is useful if you are sending new +per-directory merge files as a part of the transfer and you want their +exclusions to take effect for the delete phase of the current transfer. It +also forces rsync to use the old, non-incremental recursion algorithm that +requires rsync to scan all the files in the transfer into memory at once +(see \fB\-\-recursive\fP). See \fB\-\-delete\fP (which is implied) for +more details on file-deletion. +.IP +See also the \fB\-\-delete-delay\fP option that might be a faster choice +for those that just want the deletions to occur at the end of the transfer. +.IP "\fB\-\-delete-excluded\fP" +This option turns any unqualified exclude/include rules into server-side +rules that do not affect the receiver's deletions. +.IP +By default, an exclude or include has both a server-side effect (to "hide" +and "show" files when building the server's file list) and a receiver-side +effect (to "protect" and "risk" files when deletions are occurring). Any +rule that has no modifier to specify what sides it is executed on will be +instead treated as if it were a server-side rule only, avoiding any +"protect" effects of the rules. +.IP +A rule can still apply to both sides even with this option specified if the +rule is given both the sender & receiver modifier letters (e.g., \fB\-f'\-sr\ foo'\fP). Receiver-side protect/risk rules can also be explicitly specified +to limit the deletions. This saves you from having to edit a bunch of +\fB\-f'\-\ foo'\fP rules into \fB\-f'\-s\ foo'\fP (aka \fB\-f'H\ foo'\fP) rules (not to mention +the corresponding includes). +.IP +See the FILTER RULES section for more information. See +\fB\-\-delete\fP (which is implied) for more details on deletion. +.IP "\fB\-\-ignore-missing-args\fP" +When rsync is first processing the explicitly requested source files (e.g. +command-line arguments or \fB\-\-files-from\fP entries), it is normally +an error if the file cannot be found. This option suppresses that error, +and does not try to transfer the file. This does not affect subsequent +vanished-file errors if a file was initially found to be present and later +is no longer there. +.IP "\fB\-\-delete-missing-args\fP" +This option takes the behavior of the (implied) +\fB\-\-ignore-missing-args\fP option a step farther: each missing arg +will become a deletion request of the corresponding destination file on the +receiving side (should it exist). If the destination file is a non-empty +directory, it will only be successfully deleted if \fB\-\-force\fP or +\fB\-\-delete\fP are in effect. Other than that, this option is +independent of any other type of delete processing. +.IP +The missing source files are represented by special file-list entries which +display as a "\fB*missing\fP" entry in the \fB\-\-list-only\fP output. +.IP "\fB\-\-ignore-errors\fP" +Tells \fB\-\-delete\fP to go ahead and delete files even when there are +I/O errors. +.IP "\fB\-\-force\fP" +This option tells rsync to delete a non-empty directory when it is to be +replaced by a non-directory. This is only relevant if deletions are not +active (see \fB\-\-delete\fP for details). +.IP +Note for older rsync versions: \fB\-\-force\fP used to still be required when +using \fB\-\-delete-after\fP, and it used to be non-functional unless the +\fB\-\-recursive\fP option was also enabled. +.IP "\fB\-\-max-delete=NUM\fP" +This tells rsync not to delete more than NUM files or directories. If that +limit is exceeded, all further deletions are skipped through the end of the +transfer. At the end, rsync outputs a warning (including a count of the +skipped deletions) and exits with an error code of 25 (unless some more +important error condition also occurred). +.IP +Beginning with version 3.0.0, you may specify \fB\-\-max-delete=0\fP to be warned +about any extraneous files in the destination without removing any of them. +Older clients interpreted this as "unlimited", so if you don't know what +version the client is, you can use the less obvious \fB\-\-max-delete=\-1\fP as a +backward-compatible way to specify that no deletions be allowed (though +really old versions didn't warn when the limit was exceeded). +.IP "\fB\-\-max-size=SIZE\fP" +This tells rsync to avoid transferring any file that is larger than the +specified SIZE. A numeric value can be suffixed with a string to indicate +the numeric units or left unqualified to specify bytes. Feel free to use a +fractional value along with the units, such as \fB\-\-max-size=1.5m\fP. +.IP +This option is a TRANSFER RULE, so don't expect any +exclude side effects. +.IP +The first letter of a units string can be \fBB\fP (bytes), \fBK\fP (kilo), \fBM\fP +(mega), \fBG\fP (giga), \fBT\fP (tera), or \fBP\fP (peta). If the string is a single +char or has "ib" added to it (e.g. "G" or "GiB") then the units are +multiples of 1024. If you use a two-letter suffix that ends with a "B" +(e.g. "kb") then you get units that are multiples of 1000. The string's +letters can be any mix of upper and lower-case that you want to use. +.IP +Finally, if the string ends with either "+1" or "\-1", it is offset by one +byte in the indicated direction. The largest possible value is usually +\fB8192P-1\fP. +.IP +Examples: \fB\-\-max-size=1.5mb-1\fP is 1499999 bytes, and \fB\-\-max-size=2g+1\fP is +2147483649 bytes. +.IP +Note that rsync versions prior to 3.1.0 did not allow \fB\-\-max-size=0\fP. +.IP "\fB\-\-min-size=SIZE\fP" +This tells rsync to avoid transferring any file that is smaller than the +specified SIZE, which can help in not transferring small, junk files. See +the \fB\-\-max-size\fP option for a description of SIZE and other info. +.IP +Note that rsync versions prior to 3.1.0 did not allow \fB\-\-min-size=0\fP. +.IP "\fB\-\-max-alloc=SIZE\fP" +By default rsync limits an individual malloc/realloc to about 1GB in size. +For most people this limit works just fine and prevents a protocol error +causing rsync to request massive amounts of memory. However, if you have +many millions of files in a transfer, a large amount of server memory, and +you don't want to split up your transfer into multiple parts, you can +increase the per-allocation limit to something larger and rsync will +consume more memory. +.IP +Keep in mind that this is not a limit on the total size of allocated +memory. It is a sanity-check value for each individual allocation. +.IP +See the \fB\-\-max-size\fP option for a description of how SIZE can be +specified. The default suffix if none is given is bytes. +.IP +Beginning in 3.2.3, a value of 0 specifies no limit. +.IP +You can set a default value using the environment variable +\fBRSYNC_MAX_ALLOC\fP using the same SIZE values as supported by this +option. If the remote rsync doesn't understand the \fB\-\-max-alloc\fP option, +you can override an environmental value by specifying \fB\-\-max-alloc=1g\fP, +which will make rsync avoid sending the option to the remote side (because +"1G" is the default). +.IP "\fB\-\-block-size=SIZE\fP, \fB\-B\fP" +This forces the block size used in rsync's delta-transfer algorithm to a +fixed value. It is normally selected based on the size of each file being +updated. See the technical report for details. +.IP +Beginning in 3.2.3 the SIZE can be specified with a suffix as detailed in +the \fB\-\-max-size\fP option. Older versions only accepted a byte count. +.IP "\fB\-\-rsh=COMMAND\fP, \fB\-e\fP" +This option allows you to choose an alternative remote shell program to use +for communication between the local and remote copies of rsync. Typically, +rsync is configured to use ssh by default, but you may prefer to use rsh on +a local network. +.IP +If this option is used with \fB[user@]host::module/path\fP, then the remote +shell \fICOMMAND\fP will be used to run an rsync daemon on the remote host, and +all data will be transmitted through that remote shell connection, rather +than through a direct socket connection to a running rsync daemon on the +remote host. See the USING RSYNC-DAEMON FEATURES VIA A REMOTE-SHELL +CONNECTION section above. +.IP +Beginning with rsync 3.2.0, the \fBRSYNC_PORT\fP environment variable will +be set when a daemon connection is being made via a remote-shell +connection. It is set to 0 if the default daemon port is being assumed, or +it is set to the value of the rsync port that was specified via either the +\fB\-\-port\fP option or a non-empty port value in an \fBrsync://\fP URL. +This allows the script to discern if a non-default port is being requested, +allowing for things such as an SSL or stunnel helper script to connect to a +default or alternate port. +.IP +Command-line arguments are permitted in COMMAND provided that COMMAND is +presented to rsync as a single argument. You must use spaces (not tabs or +other whitespace) to separate the command and args from each other, and you +can use single- and/or double-quotes to preserve spaces in an argument (but +not backslashes). Note that doubling a single-quote inside a single-quoted +string gives you a single-quote; likewise for double-quotes (though you +need to pay attention to which quotes your shell is parsing and which +quotes rsync is parsing). Some examples: +.RS 4 +.IP +.nf +-e 'ssh -p 2234' +-e 'ssh -o "ProxyCommand nohup ssh firewall nc -w1 %h %p"' +.fi +.RE +.IP +(Note that ssh users can alternately customize site-specific connect +options in their .ssh/config file.) +.IP +You can also choose the remote shell program using the \fBRSYNC_RSH\fP +environment variable, which accepts the same range of values as \fB\-e\fP. +.IP +See also the \fB\-\-blocking-io\fP option which is affected by this +option. +.IP "\fB\-\-rsync-path=PROGRAM\fP" +Use this to specify what program is to be run on the remote machine to +start-up rsync. Often used when rsync is not in the default remote-shell's +path (e.g. \fB\-\-rsync-path=/usr/local/bin/rsync\fP). Note that PROGRAM is run +with the help of a shell, so it can be any program, script, or command +sequence you'd care to run, so long as it does not corrupt the standard-in +& standard-out that rsync is using to communicate. +.IP +One tricky example is to set a different default directory on the remote +machine for use with the \fB\-\-relative\fP option. For instance: +.RS 4 +.IP +.nf +rsync -avR --rsync-path="cd /a/b && rsync" host:c/d /e/ +.fi +.RE +.IP "\fB\-\-remote-option=OPTION\fP, \fB\-M\fP" +This option is used for more advanced situations where you want certain +effects to be limited to one side of the transfer only. For instance, if +you want to pass \fB\-\-log-file=FILE\fP and \fB\-\-fake-super\fP to +the remote system, specify it like this: +.RS 4 +.IP +.nf +rsync -av -M --log-file=foo -M--fake-super src/ dest/ +.fi +.RE +.IP +If you want to have an option affect only the local side of a transfer when +it normally affects both sides, send its negation to the remote side. Like +this: +.RS 4 +.IP +.nf +rsync -av -x -M--no-x src/ dest/ +.fi +.RE +.IP +Be cautious using this, as it is possible to toggle an option that will +cause rsync to have a different idea about what data to expect next over +the socket, and that will make it fail in a cryptic fashion. +.IP +Note that you should use a separate \fB\-M\fP option for each remote option you +want to pass. On older rsync versions, the presence of any spaces in the +remote-option arg could cause it to be split into separate remote args, but +this requires the use of \fB\-\-old-args\fP in a modern rsync. +.IP +When performing a local transfer, the "local" side is the sender and the +"remote" side is the receiver. +.IP +Note some versions of the popt option-parsing library have a bug in them +that prevents you from using an adjacent arg with an equal in it next to a +short option letter (e.g. \fB\-M\-\-log-file=/tmp/foo\fP). If this bug affects +your version of popt, you can use the version of popt that is included with +rsync. +.IP "\fB\-\-cvs-exclude\fP, \fB\-C\fP" +This is a useful shorthand for excluding a broad range of files that you +often don't want to transfer between systems. It uses a similar algorithm +to CVS to determine if a file should be ignored. +.IP +The exclude list is initialized to exclude the following items (these +initial items are marked as perishable\ \-\- see the FILTER RULES +section): +.RS 4 +.IP +\fBRCS\fP +\fBSCCS\fP +\fBCVS\fP +\fBCVS.adm\fP +\fBRCSLOG\fP +\fBcvslog.*\fP +\fBtags\fP +\fBTAGS\fP +\fB.make.state\fP +\fB.nse_depinfo\fP +\fB*~\fP +\fB#*\fP +\fB.#*\fP +\fB,*\fP +\fB_$*\fP +\fB*$\fP +\fB*.old\fP +\fB*.bak\fP +\fB*.BAK\fP +\fB*.orig\fP +\fB*.rej\fP +\fB.del-*\fP +\fB*.a\fP +\fB*.olb\fP +\fB*.o\fP +\fB*.obj\fP +\fB*.so\fP +\fB*.exe\fP +\fB*.Z\fP +\fB*.elc\fP +\fB*.ln\fP +\fBcore\fP +\fB.svn/\fP +\fB.git/\fP +\fB.hg/\fP +\fB.bzr/\fP +.RE +.IP +then, files listed in a $HOME/.cvsignore are added to the list and any +files listed in the CVSIGNORE environment variable (all cvsignore names are +delimited by whitespace). +.IP +Finally, any file is ignored if it is in the same directory as a .cvsignore +file and matches one of the patterns listed therein. Unlike rsync's +filter/exclude files, these patterns are split on whitespace. See the +\fBcvs\fP(1) manual for more information. +.IP +If you're combining \fB\-C\fP with your own \fB\-\-filter\fP rules, you should +note that these CVS excludes are appended at the end of your own rules, +regardless of where the \fB\-C\fP was placed on the command-line. This makes +them a lower priority than any rules you specified explicitly. If you want +to control where these CVS excludes get inserted into your filter rules, +you should omit the \fB\-C\fP as a command-line option and use a combination of +\fB\-\-filter=:C\fP and \fB\-\-filter=\-C\fP (either on your +command-line or by putting the ":C" and "\-C" rules into a filter file with +your other rules). The first option turns on the per-directory scanning +for the .cvsignore file. The second option does a one-time import of the +CVS excludes mentioned above. +.IP "\fB\-\-filter=RULE\fP, \fB\-f\fP" +This option allows you to add rules to selectively exclude certain files +from the list of files to be transferred. This is most useful in +combination with a recursive transfer. +.IP +You may use as many \fB\-\-filter\fP options on the command line as you like to +build up the list of files to exclude. If the filter contains whitespace, +be sure to quote it so that the shell gives the rule to rsync as a single +argument. The text below also mentions that you can use an underscore to +replace the space that separates a rule from its arg. +.IP +See the FILTER RULES section for detailed information on this option. +.IP "\fB\-F\fP" +The \fB\-F\fP option is a shorthand for adding two \fB\-\-filter\fP rules to +your command. The first time it is used is a shorthand for this rule: +.RS 4 +.IP +.nf +--filter='dir-merge /.rsync-filter' +.fi +.RE +.IP +This tells rsync to look for per-directory .rsync-filter files that have +been sprinkled through the hierarchy and use their rules to filter the +files in the transfer. If \fB\-F\fP is repeated, it is a shorthand for this +rule: +.RS 4 +.IP +.nf +--filter='exclude .rsync-filter' +.fi +.RE +.IP +This filters out the .rsync-filter files themselves from the transfer. +.IP +See the FILTER RULES section for detailed information on how these +options work. +.IP "\fB\-\-exclude=PATTERN\fP" +This option is a simplified form of the \fB\-\-filter\fP option that +specifies an exclude rule and does not allow the full rule-parsing syntax +of normal filter rules. This is equivalent to specifying \fB\-f'\-\ PATTERN'\fP. +.IP +See the FILTER RULES section for detailed information on this option. +.IP "\fB\-\-exclude-from=FILE\fP" +This option is related to the \fB\-\-exclude\fP option, but it specifies +a FILE that contains exclude patterns (one per line). Blank lines in the +file are ignored, as are whole-line comments that start with '\fB;\fP' or '\fB#\fP' +(filename rules that contain those characters are unaffected). +.IP +If a line begins with "\fB\-\ \fP" (dash, space) or "\fB+\ \fP" (plus, space), then +the type of rule is being explicitly specified as an exclude or an include +(respectively). Any rules without such a prefix are taken to be an exclude. +.IP +If a line consists of just "\fB!\fP", then the current filter rules are cleared +before adding any further rules. +.IP +If \fIFILE\fP is '\fB\-\fP', the list will be read from standard input. +.IP "\fB\-\-include=PATTERN\fP" +This option is a simplified form of the \fB\-\-filter\fP option that +specifies an include rule and does not allow the full rule-parsing syntax +of normal filter rules. This is equivalent to specifying \fB\-f'+\ PATTERN'\fP. +.IP +See the FILTER RULES section for detailed information on this option. +.IP "\fB\-\-include-from=FILE\fP" +This option is related to the \fB\-\-include\fP option, but it specifies +a FILE that contains include patterns (one per line). Blank lines in the +file are ignored, as are whole-line comments that start with '\fB;\fP' or '\fB#\fP' +(filename rules that contain those characters are unaffected). +.IP +If a line begins with "\fB\-\ \fP" (dash, space) or "\fB+\ \fP" (plus, space), then +the type of rule is being explicitly specified as an exclude or an include +(respectively). Any rules without such a prefix are taken to be an include. +.IP +If a line consists of just "\fB!\fP", then the current filter rules are cleared +before adding any further rules. +.IP +If \fIFILE\fP is '\fB\-\fP', the list will be read from standard input. +.IP "\fB\-\-files-from=FILE\fP" +Using this option allows you to specify the exact list of files to transfer +(as read from the specified FILE or '\fB\-\fP' for standard input). It also +tweaks the default behavior of rsync to make transferring just the +specified files and directories easier: +.IP +.RS +.IP o +The \fB\-\-relative\fP (\fB\-R\fP) option is implied, which preserves the +path information that is specified for each item in the file (use +\fB\-\-no-relative\fP or \fB\-\-no-R\fP if you want to turn that off). +.IP o +The \fB\-\-dirs\fP (\fB\-d\fP) option is implied, which will create +directories specified in the list on the destination rather than noisily +skipping them (use \fB\-\-no-dirs\fP or \fB\-\-no-d\fP if you want to turn that off). +.IP o +The \fB\-\-archive\fP (\fB\-a\fP) option's behavior does not imply +\fB\-\-recursive\fP (\fB\-r\fP), so specify it explicitly, if you want it. +.IP o +These side-effects change the default state of rsync, so the position of +the \fB\-\-files-from\fP option on the command-line has no bearing on how other +options are parsed (e.g. \fB\-a\fP works the same before or after +\fB\-\-files-from\fP, as does \fB\-\-no-R\fP and all other options). +.RE +.IP +The filenames that are read from the FILE are all relative to the source +dir\ \-\- any leading slashes are removed and no ".." references are allowed +to go higher than the source dir. For example, take this command: +.RS 4 +.IP +.nf +rsync -a --files-from=/tmp/foo /usr remote:/backup +.fi +.RE +.IP +If /tmp/foo contains the string "bin" (or even "/bin"), the /usr/bin +directory will be created as /backup/bin on the remote host. If it +contains "bin/" (note the trailing slash), the immediate contents of the +directory would also be sent (without needing to be explicitly mentioned in +the file\ \-\- this began in version 2.6.4). In both cases, if the +\fB\-r\fP option was enabled, that dir's entire hierarchy would also be +transferred (keep in mind that \fB\-r\fP needs to be specified +explicitly with \fB\-\-files-from\fP, since it is not implied by \fB\-a\fP. +Also note that the effect of the (enabled by default) \fB\-r\fP option +is to duplicate only the path info that is read from the file\ \-\- it does +not force the duplication of the source-spec path (/usr in this case). +.IP +In addition, the \fB\-\-files-from\fP file can be read from the remote host +instead of the local host if you specify a "host:" in front of the file +(the host must match one end of the transfer). As a short-cut, you can +specify just a prefix of ":" to mean "use the remote end of the transfer". +For example: +.RS 4 +.IP +.nf +rsync -a --files-from=:/path/file-list src:/ /tmp/copy +.fi +.RE +.IP +This would copy all the files specified in the /path/file-list file that +was located on the remote "src" host. +.IP +If the \fB\-\-iconv\fP and \fB\-\-secluded-args\fP options are specified +and the \fB\-\-files-from\fP filenames are being sent from one host to another, +the filenames will be translated from the sending host's charset to the +receiving host's charset. +.IP +NOTE: sorting the list of files in the \fB\-\-files-from\fP input helps rsync to +be more efficient, as it will avoid re-visiting the path elements that are +shared between adjacent entries. If the input is not sorted, some path +elements (implied directories) may end up being scanned multiple times, and +rsync will eventually unduplicate them after they get turned into file-list +elements. +.IP "\fB\-\-from0\fP, \fB\-0\fP" +This tells rsync that the rules/filenames it reads from a file are +terminated by a null ('\\0') character, not a NL, CR, or CR+LF. This +affects \fB\-\-exclude-from\fP, \fB\-\-include-from\fP, +\fB\-\-files-from\fP, and any merged files specified in a +\fB\-\-filter\fP rule. It does not affect \fB\-\-cvs-exclude\fP (since +all names read from a .cvsignore file are split on whitespace). +.IP "\fB\-\-old-args\fP" +This option tells rsync to stop trying to protect the arg values on the +remote side from unintended word-splitting or other misinterpretation. +It also allows the client to treat an empty arg as a "." instead of +generating an error. +.IP +The default in a modern rsync is for "shell-active" characters (including +spaces) to be backslash-escaped in the args that are sent to the remote +shell. The wildcard characters \fB*\fP, \fB?\fP, \fB[\fP, & \fB]\fP are not escaped in +filename args (allowing them to expand into multiple filenames) while being +protected in option args, such as \fB\-\-usermap\fP. +.IP +If you have a script that wants to use old-style arg splitting in its +filenames, specify this option once. If the remote shell has a problem +with any backslash escapes at all, specify this option twice. +.IP +You may also control this setting via the \fBRSYNC_OLD_ARGS\fP environment +variable. If it has the value "1", rsync will default to a single-option +setting. If it has the value "2" (or more), rsync will default to a +repeated-option setting. If it is "0", you'll get the default escaping +behavior. The environment is always overridden by manually specified +positive or negative options (the negative is \fB\-\-no-old-args\fP). +.IP +Note that this option also disables the extra safety check added in 3.2.5 +that ensures that a remote sender isn't including extra top-level items in +the file-list that you didn't request. This side-effect is necessary +because we can't know for sure what names to expect when the remote shell +is interpreting the args. +.IP +This option conflicts with the \fB\-\-secluded-args\fP option. +.IP "\fB\-\-secluded-args\fP, \fB\-s\fP" +This option sends all filenames and most options to the remote rsync via +the protocol (not the remote shell command line) which avoids letting the +remote shell modify them. Wildcards are expanded on the remote host by +rsync instead of a shell. +.IP +This is similar to the default backslash-escaping of args that was added +in 3.2.4 (see \fB\-\-old-args\fP) in that it prevents things like space +splitting and unwanted special-character side-effects. However, it has the +drawbacks of being incompatible with older rsync versions (prior to 3.0.0) +and of being refused by restricted shells that want to be able to inspect +all the option values for safety. +.IP +This option is useful for those times that you need the argument's +character set to be converted for the remote host, if the remote shell is +incompatible with the default backslash-escpaing method, or there is some +other reason that you want the majority of the options and arguments to +bypass the command-line of the remote shell. +.IP +If you combine this option with \fB\-\-iconv\fP, the args related to the +remote side will be translated from the local to the remote character-set. +The translation happens before wild-cards are expanded. See also the +\fB\-\-files-from\fP option. +.IP +You may also control this setting via the \fBRSYNC_PROTECT_ARGS\fP +environment variable. If it has a non-zero value, this setting will be +enabled by default, otherwise it will be disabled by default. Either state +is overridden by a manually specified positive or negative version of this +option (note that \fB\-\-no-s\fP and \fB\-\-no-secluded-args\fP are the negative +versions). This environment variable is also superseded by a non-zero +\fBRSYNC_OLD_ARGS\fP export. +.IP +This option conflicts with the \fB\-\-old-args\fP option. +.IP +This option used to be called \fB\-\-protect-args\fP (before 3.2.6) and that +older name can still be used (though specifying it as \fB\-s\fP is always the +easiest and most compatible choice). +.IP "\fB\-\-trust-sender\fP" +This option disables two extra validation checks that a local client +performs on the file list generated by a remote sender. This option should +only be used if you trust the sender to not put something malicious in the +file list (something that could possibly be done via a modified rsync, a +modified shell, or some other similar manipulation). +.IP +Normally, the rsync client (as of version 3.2.5) runs two extra validation +checks when pulling files from a remote rsync: +.IP +.RS +.IP o +It verifies that additional arg items didn't get added at the top of the +transfer. +.IP o +It verifies that none of the items in the file list are names that should +have been excluded (if filter rules were specified). +.RE +.IP +Note that various options can turn off one or both of these checks if the +option interferes with the validation. For instance: +.IP +.RS +.IP o +Using a per-directory filter file reads filter rules that only the server +knows about, so the filter checking is disabled. +.IP o +Using the \fB\-\-old-args\fP option allows the sender to manipulate the +requested args, so the arg checking is disabled. +.IP o +Reading the files-from list from the server side means that the client +doesn't know the arg list, so the arg checking is disabled. +.IP o +Using \fB\-\-read-batch\fP disables both checks since the batch file's +contents will have been verified when it was created. +.RE +.IP +This option may help an under-powered client server if the extra pattern +matching is slowing things down on a huge transfer. It can also be used to +work around a currently-unknown bug in the verification logic for a transfer +from a trusted sender. +.IP +When using this option it is a good idea to specify a dedicated destination +directory, as discussed in the MULTI-HOST SECURITY section. +.IP "\fB\-\-copy-as=USER[:GROUP]\fP" +This option instructs rsync to use the USER and (if specified after a +colon) the GROUP for the copy operations. This only works if the user that +is running rsync has the ability to change users. If the group is not +specified then the user's default groups are used. +.IP +This option can help to reduce the risk of an rsync being run as root into +or out of a directory that might have live changes happening to it and you +want to make sure that root-level read or write actions of system files are +not possible. While you could alternatively run all of rsync as the +specified user, sometimes you need the root-level host-access credentials +to be used, so this allows rsync to drop root for the copying part of the +operation after the remote-shell or daemon connection is established. +.IP +The option only affects one side of the transfer unless the transfer is +local, in which case it affects both sides. Use the +\fB\-\-remote-option\fP to affect the remote side, such as +\fB\-M\-\-copy-as=joe\fP. For a local transfer, the lsh (or lsh.sh) support file +provides a local-shell helper script that can be used to allow a +"localhost:" or "lh:" host-spec to be specified without needing to setup +any remote shells, allowing you to specify remote options that affect the +side of the transfer that is using the host-spec (and using hostname "lh" +avoids the overriding of the remote directory to the user's home dir). +.IP +For example, the following rsync writes the local files as user "joe": +.RS 4 +.IP +.nf +sudo rsync -aiv --copy-as=joe host1:backups/joe/ /home/joe/ +.fi +.RE +.IP +This makes all files owned by user "joe", limits the groups to those that +are available to that user, and makes it impossible for the joe user to do +a timed exploit of the path to induce a change to a file that the joe user +has no permissions to change. +.IP +The following command does a local copy into the "dest/" dir as user "joe" +(assuming you've installed support/lsh into a dir on your $PATH): +.RS 4 +.IP +.nf +sudo rsync -aive lsh -M--copy-as=joe src/ lh:dest/ +.fi +.RE +.IP "\fB\-\-temp-dir=DIR\fP, \fB\-T\fP" +This option instructs rsync to use DIR as a scratch directory when creating +temporary copies of the files transferred on the receiving side. The +default behavior is to create each temporary file in the same directory as +the associated destination file. Beginning with rsync 3.1.1, the temp-file +names inside the specified DIR will not be prefixed with an extra dot +(though they will still have a random suffix added). +.IP +This option is most often used when the receiving disk partition does not +have enough free space to hold a copy of the largest file in the transfer. +In this case (i.e. when the scratch directory is on a different disk +partition), rsync will not be able to rename each received temporary file +over the top of the associated destination file, but instead must copy it +into place. Rsync does this by copying the file over the top of the +destination file, which means that the destination file will contain +truncated data during this copy. If this were not done this way (even if +the destination file were first removed, the data locally copied to a +temporary file in the destination directory, and then renamed into place) +it would be possible for the old file to continue taking up disk space (if +someone had it open), and thus there might not be enough room to fit the +new version on the disk at the same time. +.IP +If you are using this option for reasons other than a shortage of disk +space, you may wish to combine it with the \fB\-\-delay-updates\fP +option, which will ensure that all copied files get put into subdirectories +in the destination hierarchy, awaiting the end of the transfer. If you +don't have enough room to duplicate all the arriving files on the +destination partition, another way to tell rsync that you aren't overly +concerned about disk space is to use the \fB\-\-partial-dir\fP option +with a relative path; because this tells rsync that it is OK to stash off a +copy of a single file in a subdir in the destination hierarchy, rsync will +use the partial-dir as a staging area to bring over the copied file, and +then rename it into place from there. (Specifying a \fB\-\-partial-dir\fP +with an absolute path does not have this side-effect.) +.IP "\fB\-\-fuzzy\fP, \fB\-y\fP" +This option tells rsync that it should look for a basis file for any +destination file that is missing. The current algorithm looks in the same +directory as the destination file for either a file that has an identical +size and modified-time, or a similarly-named file. If found, rsync uses +the fuzzy basis file to try to speed up the transfer. +.IP +If the option is repeated, the fuzzy scan will also be done in any matching +alternate destination directories that are specified via +\fB\-\-compare-dest\fP, \fB\-\-copy-dest\fP, or \fB\-\-link-dest\fP. +.IP +Note that the use of the \fB\-\-delete\fP option might get rid of any +potential fuzzy-match files, so either use \fB\-\-delete-after\fP or +specify some filename exclusions if you need to prevent this. +.IP "\fB\-\-compare-dest=DIR\fP" +This option instructs rsync to use \fIDIR\fP on the destination machine as an +additional hierarchy to compare destination files against doing transfers +(if the files are missing in the destination directory). If a file is +found in \fIDIR\fP that is identical to the sender's file, the file will NOT be +transferred to the destination directory. This is useful for creating a +sparse backup of just files that have changed from an earlier backup. This +option is typically used to copy into an empty (or newly created) +directory. +.IP +Beginning in version 2.6.4, multiple \fB\-\-compare-dest\fP directories may be +provided, which will cause rsync to search the list in the order specified +for an exact match. If a match is found that differs only in attributes, a +local copy is made and the attributes updated. If a match is not found, a +basis file from one of the \fIDIRs\fP will be selected to try to speed up the +transfer. +.IP +If \fIDIR\fP is a relative path, it is relative to the destination directory. +See also \fB\-\-copy-dest\fP and \fB\-\-link-dest\fP. +.IP +NOTE: beginning with version 3.1.0, rsync will remove a file from a +non-empty destination hierarchy if an exact match is found in one of the +compare-dest hierarchies (making the end result more closely match a fresh +copy). +.IP "\fB\-\-copy-dest=DIR\fP" +This option behaves like \fB\-\-compare-dest\fP, but rsync will also copy +unchanged files found in \fIDIR\fP to the destination directory using a local +copy. This is useful for doing transfers to a new destination while +leaving existing files intact, and then doing a flash-cutover when all +files have been successfully transferred. +.IP +Multiple \fB\-\-copy-dest\fP directories may be provided, which will cause rsync +to search the list in the order specified for an unchanged file. If a +match is not found, a basis file from one of the \fIDIRs\fP will be selected to +try to speed up the transfer. +.IP +If \fIDIR\fP is a relative path, it is relative to the destination directory. +See also \fB\-\-compare-dest\fP and \fB\-\-link-dest\fP. +.IP "\fB\-\-link-dest=DIR\fP" +This option behaves like \fB\-\-copy-dest\fP, but unchanged files are +hard linked from \fIDIR\fP to the destination directory. The files must be +identical in all preserved attributes (e.g. permissions, possibly +ownership) in order for the files to be linked together. An example: +.RS 4 +.IP +.nf +rsync -av --link-dest=$PWD/prior_dir host:src_dir/ new_dir/ +.fi +.RE +.IP +If files aren't linking, double-check their attributes. Also check if +some attributes are getting forced outside of rsync's control, such a mount +option that squishes root to a single user, or mounts a removable drive +with generic ownership (such as OS X's "Ignore ownership on this volume" +option). +.IP +Beginning in version 2.6.4, multiple \fB\-\-link-dest\fP directories may be +provided, which will cause rsync to search the list in the order specified +for an exact match (there is a limit of 20 such directories). If a match +is found that differs only in attributes, a local copy is made and the +attributes updated. If a match is not found, a basis file from one of the +\fIDIRs\fP will be selected to try to speed up the transfer. +.IP +This option works best when copying into an empty destination hierarchy, as +existing files may get their attributes tweaked, and that can affect +alternate destination files via hard-links. Also, itemizing of changes can +get a bit muddled. Note that prior to version 3.1.0, an +alternate-directory exact match would never be found (nor linked into the +destination) when a destination file already exists. +.IP +Note that if you combine this option with \fB\-\-ignore-times\fP, rsync will not +link any files together because it only links identical files together as a +substitute for transferring the file, never as an additional check after +the file is updated. +.IP +If \fIDIR\fP is a relative path, it is relative to the destination directory. +See also \fB\-\-compare-dest\fP and \fB\-\-copy-dest\fP. +.IP +Note that rsync versions prior to 2.6.1 had a bug that could prevent +\fB\-\-link-dest\fP from working properly for a non-super-user when +\fB\-\-owner\fP (\fB\-o\fP) was specified (or implied). You can work-around +this bug by avoiding the \fB\-o\fP option (or using \fB\-\-no-o\fP) when sending to an +old rsync. +.IP "\fB\-\-compress\fP, \fB\-z\fP" +With this option, rsync compresses the file data as it is sent to the +destination machine, which reduces the amount of data being transmitted\ \-\- +something that is useful over a slow connection. +.IP +Rsync supports multiple compression methods and will choose one for you +unless you force the choice using the \fB\-\-compress-choice\fP (\fB\-\-zc\fP) +option. +.IP +Run \fBrsync\ \-\-version\fP to see the default compress list compiled into your +version. +.IP +When both sides of the transfer are at least 3.2.0, rsync chooses the first +algorithm in the client's list of choices that is also in the server's list +of choices. If no common compress choice is found, rsync exits with +an error. If the remote rsync is too old to support checksum negotiation, +its list is assumed to be "zlib". +.IP +The default order can be customized by setting the environment variable +\fBRSYNC_COMPRESS_LIST\fP to a space-separated list of acceptable +compression names. If the string contains a "\fB&\fP" character, it is +separated into the "client string & server string", otherwise the same +string applies to both. If the string (or string portion) contains no +non-whitespace characters, the default compress list is used. Any unknown +compression names are discarded from the list, but a list with only invalid +names results in a failed negotiation. +.IP +There are some older rsync versions that were configured to reject a \fB\-z\fP +option and require the use of \fB\-zz\fP because their compression library was +not compatible with the default zlib compression method. You can usually +ignore this weirdness unless the rsync server complains and tells you to +specify \fB\-zz\fP. +.IP "\fB\-\-compress-choice=STR\fP, \fB\-\-zc=STR\fP" +This option can be used to override the automatic negotiation of the +compression algorithm that occurs when \fB\-\-compress\fP is used. The +option implies \fB\-\-compress\fP unless "none" was specified, which +instead implies \fB\-\-no-compress\fP. +.IP +The compression options that you may be able to use are: +.IP +.RS +.IP o +\fBzstd\fP +.IP o +\fBlz4\fP +.IP o +\fBzlibx\fP +.IP o +\fBzlib\fP +.IP o +\fBnone\fP +.RE +.IP +Run \fBrsync\ \-\-version\fP to see the default compress list compiled into your +version (which may differ from the list above). +.IP +Note that if you see an error about an option named \fB\-\-old-compress\fP or +\fB\-\-new-compress\fP, this is rsync trying to send the \fB\-\-compress-choice=zlib\fP +or \fB\-\-compress-choice=zlibx\fP option in a backward-compatible manner that +more rsync versions understand. This error indicates that the older rsync +version on the server will not allow you to force the compression type. +.IP +Note that the "zlibx" compression algorithm is just the "zlib" algorithm +with matched data excluded from the compression stream (to try to make it +more compatible with an external zlib implementation). +.IP "\fB\-\-compress-level=NUM\fP, \fB\-\-zl=NUM\fP" +Explicitly set the compression level to use (see \fB\-\-compress\fP, +\fB\-z\fP) instead of letting it default. The \fB\-\-compress\fP option is +implied as long as the level chosen is not a "don't compress" level for the +compression algorithm that is in effect (e.g. zlib compression treats level +0 as "off"). +.IP +The level values vary depending on the checksum in effect. Because rsync +will negotiate a checksum choice by default (when the remote rsync is new +enough), it can be good to combine this option with a +\fB\-\-compress-choice\fP (\fB\-\-zc\fP) option unless you're sure of the +choice in effect. For example: +.RS 4 +.IP +.nf +rsync -aiv --zc=zstd --zl=22 host:src/ dest/ +.fi +.RE +.IP +For zlib & zlibx compression the valid values are from 1 to 9 with 6 being +the default. Specifying \fB\-\-zl=0\fP turns compression off, and specifying +\fB\-\-zl=\-1\fP chooses the default level of 6. +.IP +For zstd compression the valid values are from \-131072 to 22 with 3 being +the default. Specifying 0 chooses the default of 3. +.IP +For lz4 compression there are no levels, so the value is always 0. +.IP +If you specify a too-large or too-small value, the number is silently +limited to a valid value. This allows you to specify something like +\fB\-\-zl=999999999\fP and be assured that you'll end up with the maximum +compression level no matter what algorithm was chosen. +.IP +If you want to know the compression level that is in effect, specify +\fB\-\-debug=nstr\fP to see the "negotiated string" results. This will +report something like "\fBClient\ compress:\ zstd\ (level\ 3)\fP" (along with the +checksum choice in effect). +.IP "\fB\-\-skip-compress=LIST\fP" +\fBNOTE:\fP no compression method currently supports per-file compression +changes, so this option has no effect. +.IP +Override the list of file suffixes that will be compressed as little as +possible. Rsync sets the compression level on a per-file basis based on +the file's suffix. If the compression algorithm has an "off" level, then +no compression occurs for those files. Other algorithms that support +changing the streaming level on-the-fly will have the level minimized to +reduces the CPU usage as much as possible for a matching file. +.IP +The \fBLIST\fP should be one or more file suffixes (without the dot) separated +by slashes (\fB/\fP). You may specify an empty string to indicate that no files +should be skipped. +.IP +Simple character-class matching is supported: each must consist of a list +of letters inside the square brackets (e.g. no special classes, such as +"[:alpha:]", are supported, and '\-' has no special meaning). +.IP +The characters asterisk (\fB*\fP) and question-mark (\fB?\fP) have no special meaning. +.IP +Here's an example that specifies 6 suffixes to skip (since 1 of the 5 rules +matches 2 suffixes): +.RS 4 +.IP +.nf +--skip-compress=gz/jpg/mp[34]/7z/bz2 +.fi +.RE +.IP +The default file suffixes in the skip-compress list in this version of +rsync are: +.RS 4 +.IP +3g2 +3gp +7z +aac +ace +apk +avi +bz2 +deb +dmg +ear +f4v +flac +flv +gpg +gz +iso +jar +jpeg +jpg +lrz +lz +lz4 +lzma +lzo +m1a +m1v +m2a +m2ts +m2v +m4a +m4b +m4p +m4r +m4v +mka +mkv +mov +mp1 +mp2 +mp3 +mp4 +mpa +mpeg +mpg +mpv +mts +odb +odf +odg +odi +odm +odp +ods +odt +oga +ogg +ogm +ogv +ogx +opus +otg +oth +otp +ots +ott +oxt +png +qt +rar +rpm +rz +rzip +spx +squashfs +sxc +sxd +sxg +sxm +sxw +sz +tbz +tbz2 +tgz +tlz +ts +txz +tzo +vob +war +webm +webp +xz +z +zip +zst +.RE +.IP +This list will be replaced by your \fB\-\-skip-compress\fP list in all but one +situation: a copy from a daemon rsync will add your skipped suffixes to its +list of non-compressing files (and its list may be configured to a +different default). +.IP "\fB\-\-numeric-ids\fP" +With this option rsync will transfer numeric group and user IDs rather than +using user and group names and mapping them at both ends. +.IP +By default rsync will use the username and groupname to determine what +ownership to give files. The special uid 0 and the special group 0 are +never mapped via user/group names even if the \fB\-\-numeric-ids\fP option is not +specified. +.IP +If a user or group has no name on the source system or it has no match on +the destination system, then the numeric ID from the source system is used +instead. See also the \fBuse\ chroot\fP setting +in the rsyncd.conf manpage for some comments on how the chroot setting +affects rsync's ability to look up the names of the users and groups and +what you can do about it. +.IP "\fB\-\-usermap=STRING\fP, \fB\-\-groupmap=STRING\fP" +These options allow you to specify users and groups that should be mapped +to other values by the receiving side. The \fBSTRING\fP is one or more +\fBFROM\fP:\fBTO\fP pairs of values separated by commas. Any matching \fBFROM\fP +value from the sender is replaced with a \fBTO\fP value from the receiver. +You may specify usernames or user IDs for the \fBFROM\fP and \fBTO\fP values, +and the \fBFROM\fP value may also be a wild-card string, which will be +matched against the sender's names (wild-cards do NOT match against ID +numbers, though see below for why a '\fB*\fP' matches everything). You may +instead specify a range of ID numbers via an inclusive range: LOW-HIGH. +For example: +.RS 4 +.IP +.nf +--usermap=0-99:nobody,wayne:admin,*:normal --groupmap=usr:1,1:usr +.fi +.RE +.IP +The first match in the list is the one that is used. You should specify +all your user mappings using a single \fB\-\-usermap\fP option, and/or all your +group mappings using a single \fB\-\-groupmap\fP option. +.IP +Note that the sender's name for the 0 user and group are not transmitted to +the receiver, so you should either match these values using a 0, or use the +names in effect on the receiving side (typically "root"). All other +\fBFROM\fP names match those in use on the sending side. All \fBTO\fP names +match those in use on the receiving side. +.IP +Any IDs that do not have a name on the sending side are treated as having +an empty name for the purpose of matching. This allows them to be matched +via a "\fB*\fP" or using an empty name. For instance: +.RS 4 +.IP +.nf +--usermap=:nobody --groupmap=*:nobody +.fi +.RE +.IP +When the \fB\-\-numeric-ids\fP option is used, the sender does not send any +names, so all the IDs are treated as having an empty name. This means that +you will need to specify numeric \fBFROM\fP values if you want to map these +nameless IDs to different values. +.IP +For the \fB\-\-usermap\fP option to work, the receiver will need to be running as +a super-user (see also the \fB\-\-super\fP and \fB\-\-fake-super\fP +options). For the \fB\-\-groupmap\fP option to work, the receiver will need to +have permissions to set that group. +.IP +Starting with rsync 3.2.4, the \fB\-\-usermap\fP option implies the +\fB\-\-owner\fP (\fB\-o\fP) option while the \fB\-\-groupmap\fP option implies the +\fB\-\-group\fP (\fB\-g\fP) option (since rsync needs to have those options +enabled for the mapping options to work). +.IP +An older rsync client may need to use \fB\-s\fP to avoid a complaint +about wildcard characters, but a modern rsync handles this automatically. +.IP "\fB\-\-chown=USER:GROUP\fP" +This option forces all files to be owned by USER with group GROUP. This is +a simpler interface than using \fB\-\-usermap\fP & \fB\-\-groupmap\fP +directly, but it is implemented using those options internally so they +cannot be mixed. If either the USER or GROUP is empty, no mapping for the +omitted user/group will occur. If GROUP is empty, the trailing colon may +be omitted, but if USER is empty, a leading colon must be supplied. +.IP +If you specify "\fB\-\-chown=foo:bar\fP", this is exactly the same as specifying +"\fB\-\-usermap=*:foo\ \-\-groupmap=*:bar\fP", only easier (and with the same +implied \fB\-\-owner\fP and/or \fB\-\-group\fP options). +.IP +An older rsync client may need to use \fB\-s\fP to avoid a complaint +about wildcard characters, but a modern rsync handles this automatically. +.IP "\fB\-\-timeout=SECONDS\fP" +This option allows you to set a maximum I/O timeout in seconds. If no data +is transferred for the specified time then rsync will exit. The default is +0, which means no timeout. +.IP "\fB\-\-contimeout=SECONDS\fP" +This option allows you to set the amount of time that rsync will wait for +its connection to an rsync daemon to succeed. If the timeout is reached, +rsync exits with an error. +.IP "\fB\-\-address=ADDRESS\fP" +By default rsync will bind to the wildcard address when connecting to an +rsync daemon. The \fB\-\-address\fP option allows you to specify a specific IP +address (or hostname) to bind to. +.IP +See also the daemon version of the \fB\-\-address\fP option. +.IP "\fB\-\-port=PORT\fP" +This specifies an alternate TCP port number to use rather than the default +of 873. This is only needed if you are using the double-colon (::) syntax +to connect with an rsync daemon (since the URL syntax has a way to specify +the port as a part of the URL). +.IP +See also the daemon version of the \fB\-\-port\fP option. +.IP "\fB\-\-sockopts=OPTIONS\fP" +This option can provide endless fun for people who like to tune their +systems to the utmost degree. You can set all sorts of socket options +which may make transfers faster (or slower!). Read the manpage for the +\fBsetsockopt()\fP system call for details on some of the options you may be +able to set. By default no special socket options are set. This only +affects direct socket connections to a remote rsync daemon. +.IP +See also the daemon version of the \fB\-\-sockopts\fP option. +.IP "\fB\-\-blocking-io\fP" +This tells rsync to use blocking I/O when launching a remote shell +transport. If the remote shell is either rsh or remsh, rsync defaults to +using blocking I/O, otherwise it defaults to using non-blocking I/O. (Note +that ssh prefers non-blocking I/O.) +.IP "\fB\-\-outbuf=MODE\fP" +This sets the output buffering mode. The mode can be None (aka +Unbuffered), Line, or Block (aka Full). You may specify as little as a +single letter for the mode, and use upper or lower case. +.IP +The main use of this option is to change Full buffering to Line buffering +when rsync's output is going to a file or pipe. +.IP "\fB\-\-itemize-changes\fP, \fB\-i\fP" +Requests a simple itemized list of the changes that are being made to each +file, including attribute changes. This is exactly the same as specifying +\fB\-\-out-format='%i\ %n%L'\fP. If you repeat the option, unchanged +files will also be output, but only if the receiving rsync is at least +version 2.6.7 (you can use \fB\-vv\fP with older versions of rsync, but that +also turns on the output of other verbose messages). +.IP +The "%i" escape has a cryptic output that is 11 letters long. The general +format is like the string \fBYXcstpoguax\fP, where \fBY\fP is replaced by the type +of update being done, \fBX\fP is replaced by the file-type, and the other +letters represent attributes that may be output if they are being modified. +.IP +The update types that replace the \fBY\fP are as follows: +.IP +.RS +.IP o +A \fB<\fP means that a file is being transferred to the remote host (sent). +.IP o +A \fB>\fP means that a file is being transferred to the local host +(received). +.IP o +A \fBc\fP means that a local change/creation is occurring for the item (such +as the creation of a directory or the changing of a symlink, etc.). +.IP o +A \fBh\fP means that the item is a hard link to another item (requires +\fB\-\-hard-links\fP). +.IP o +A \fB.\fP means that the item is not being updated (though it might have +attributes that are being modified). +.IP o +A \fB*\fP means that the rest of the itemized-output area contains a message +(e.g. "deleting"). +.RE +.IP +The file-types that replace the \fBX\fP are: \fBf\fP for a file, a \fBd\fP for a +directory, an \fBL\fP for a symlink, a \fBD\fP for a device, and a \fBS\fP for a +special file (e.g. named sockets and fifos). +.IP +The other letters in the string indicate if some attributes of the file +have changed, as follows: +.IP +.RS +.IP o +"\fB.\fP" \- the attribute is unchanged. +.IP o +"\fB+\fP" \- the file is newly created. +.IP o +"\fB\ \fP" \- all the attributes are unchanged (all dots turn to spaces). +.IP o +"\fB?\fP" \- the change is unknown (when the remote rsync is old). +.IP o +A letter indicates an attribute is being updated. +.RE +.IP +The attribute that is associated with each letter is as follows: +.IP +.RS +.IP o +A \fBc\fP means either that a regular file has a different checksum (requires +\fB\-\-checksum\fP) or that a symlink, device, or special file has a +changed value. Note that if you are sending files to an rsync prior to +3.0.1, this change flag will be present only for checksum-differing +regular files. +.IP o +A \fBs\fP means the size of a regular file is different and will be updated +by the file transfer. +.IP o +A \fBt\fP means the modification time is different and is being updated to +the sender's value (requires \fB\-\-times\fP). An alternate value of +\fBT\fP means that the modification time will be set to the transfer time, +which happens when a file/symlink/device is updated without +\fB\-\-times\fP and when a symlink is changed and the receiver can't +set its time. (Note: when using an rsync 3.0.0 client, you might see the +\fBs\fP flag combined with \fBt\fP instead of the proper \fBT\fP flag for this +time-setting failure.) +.IP o +A \fBp\fP means the permissions are different and are being updated to the +sender's value (requires \fB\-\-perms\fP). +.IP o +An \fBo\fP means the owner is different and is being updated to the sender's +value (requires \fB\-\-owner\fP and super-user privileges). +.IP o +A \fBg\fP means the group is different and is being updated to the sender's +value (requires \fB\-\-group\fP and the authority to set the group). +.IP o +.IP +.RS +.IP o +A \fBu\fP|\fBn\fP|\fBb\fP indicates the following information: + +\fBu\fP means the access (use) time is different and is being updated to +the sender's value (requires \fB\-\-atimes\fP) +.IP o +\fBn\fP means the create time (newness) is different and is being updated +to the sender's value (requires \fB\-\-crtimes\fP) +.IP o +\fBb\fP means that both the access and create times are being updated +.RE +.IP o +The \fBa\fP means that the ACL information is being changed. +.IP o +The \fBx\fP means that the extended attribute information is being changed. +.RE +.IP +One other output is possible: when deleting files, the "%i" will output the +string "\fB*deleting\fP" for each item that is being removed (assuming that you +are talking to a recent enough rsync that it logs deletions instead of +outputting them as a verbose message). +.IP "\fB\-\-out-format=FORMAT\fP" +This allows you to specify exactly what the rsync client outputs to the +user on a per-update basis. The format is a text string containing +embedded single-character escape sequences prefixed with a percent (%) +character. A default format of "%n%L" is assumed if either +\fB\-\-info=name\fP or \fB\-v\fP is specified (this tells you just the +name of the file and, if the item is a link, where it points). For a full +list of the possible escape characters, see the \fBlog\ format\fP setting in the rsyncd.conf manpage. +.IP +Specifying the \fB\-\-out-format\fP option implies the \fB\-\-info=name\fP +option, which will mention each file, dir, etc. that gets updated in a +significant way (a transferred file, a recreated symlink/device, or a +touched directory). In addition, if the itemize-changes escape (%i) is +included in the string (e.g. if the \fB\-\-itemize-changes\fP option was +used), the logging of names increases to mention any item that is changed +in any way (as long as the receiving side is at least 2.6.4). See the +\fB\-\-itemize-changes\fP option for a description of the output of "%i". +.IP +Rsync will output the out-format string prior to a file's transfer unless +one of the transfer-statistic escapes is requested, in which case the +logging is done at the end of the file's transfer. When this late logging +is in effect and \fB\-\-progress\fP is also specified, rsync will also +output the name of the file being transferred prior to its progress +information (followed, of course, by the out-format output). +.IP "\fB\-\-log-file=FILE\fP" +This option causes rsync to log what it is doing to a file. This is +similar to the logging that a daemon does, but can be requested for the +client side and/or the server side of a non-daemon transfer. If specified +as a client option, transfer logging will be enabled with a default format +of "%i %n%L". See the \fB\-\-log-file-format\fP option if you wish to +override this. +.IP +Here's an example command that requests the remote side to log what is +happening: +.RS 4 +.IP +.nf +rsync -av --remote-option=--log-file=/tmp/rlog src/ dest/ +.fi +.RE +.IP +This is very useful if you need to debug why a connection is closing +unexpectedly. +.IP +See also the daemon version of the \fB\-\-log-file\fP option. +.IP "\fB\-\-log-file-format=FORMAT\fP" +This allows you to specify exactly what per-update logging is put into the +file specified by the \fB\-\-log-file\fP option (which must also be +specified for this option to have any effect). If you specify an empty +string, updated files will not be mentioned in the log file. For a list of +the possible escape characters, see the \fBlog\ format\fP +setting in the rsyncd.conf manpage. +.IP +The default FORMAT used if \fB\-\-log-file\fP is specified and this +option is not is '%i %n%L'. +.IP +See also the daemon version of the \fB\-\-log-file-format\fP +option. +.IP "\fB\-\-stats\fP" +This tells rsync to print a verbose set of statistics on the file transfer, +allowing you to tell how effective rsync's delta-transfer algorithm is for +your data. This option is equivalent to \fB\-\-info=stats2\fP if +combined with 0 or 1 \fB\-v\fP options, or \fB\-\-info=stats3\fP if +combined with 2 or more \fB\-v\fP options. +.IP +The current statistics are as follows: +.IP +.RS +.IP o +\fBNumber\ of\ files\fP is the count of all "files" (in the generic sense), +which includes directories, symlinks, etc. The total count will be +followed by a list of counts by filetype (if the total is non-zero). For +example: "(reg: 5, dir: 3, link: 2, dev: 1, special: 1)" lists the totals +for regular files, directories, symlinks, devices, and special files. If +any of value is 0, it is completely omitted from the list. +.IP o +\fBNumber\ of\ created\ files\fP is the count of how many "files" (generic +sense) were created (as opposed to updated). The total count will be +followed by a list of counts by filetype (if the total is non-zero). +.IP o +\fBNumber\ of\ deleted\ files\fP is the count of how many "files" (generic +sense) were deleted. The total count will be +followed by a list of counts by filetype (if the total is non-zero). +Note that this line is only output if deletions are in effect, and only +if protocol 31 is being used (the default for rsync 3.1.x). +.IP o +\fBNumber\ of\ regular\ files\ transferred\fP is the count of normal files that +were updated via rsync's delta-transfer algorithm, which does not include +dirs, symlinks, etc. Note that rsync 3.1.0 added the word "regular" into +this heading. +.IP o +\fBTotal\ file\ size\fP is the total sum of all file sizes in the transfer. +This does not count any size for directories or special files, but does +include the size of symlinks. +.IP o +\fBTotal\ transferred\ file\ size\fP is the total sum of all files sizes for +just the transferred files. +.IP o +\fBLiteral\ data\fP is how much unmatched file-update data we had to send to +the receiver for it to recreate the updated files. +.IP o +\fBMatched\ data\fP is how much data the receiver got locally when recreating +the updated files. +.IP o +\fBFile\ list\ size\fP is how big the file-list data was when the sender sent +it to the receiver. This is smaller than the in-memory size for the file +list due to some compressing of duplicated data when rsync sends the +list. +.IP o +\fBFile\ list\ generation\ time\fP is the number of seconds that the sender +spent creating the file list. This requires a modern rsync on the +sending side for this to be present. +.IP o +\fBFile\ list\ transfer\ time\fP is the number of seconds that the sender spent +sending the file list to the receiver. +.IP o +\fBTotal\ bytes\ sent\fP is the count of all the bytes that rsync sent from the +client side to the server side. +.IP o +\fBTotal\ bytes\ received\fP is the count of all non-message bytes that rsync +received by the client side from the server side. "Non-message" bytes +means that we don't count the bytes for a verbose message that the server +sent to us, which makes the stats more consistent. +.RE +.IP "\fB\-\-8-bit-output\fP, \fB\-8\fP" +This tells rsync to leave all high-bit characters unescaped in the output +instead of trying to test them to see if they're valid in the current +locale and escaping the invalid ones. All control characters (but never +tabs) are always escaped, regardless of this option's setting. +.IP +The escape idiom that started in 2.6.7 is to output a literal backslash +(\fB\\\fP) and a hash (\fB#\fP), followed by exactly 3 octal digits. For example, a +newline would output as "\fB\\#012\fP". A literal backslash that is in a +filename is not escaped unless it is followed by a hash and 3 digits (0-9). +.IP "\fB\-\-human-readable\fP, \fB\-h\fP" +Output numbers in a more human-readable format. There are 3 possible levels: +.RS +.IP +.IP 1. +output numbers with a separator between each set of 3 digits (either a +comma or a period, depending on if the decimal point is represented by a +period or a comma). +.IP 2. +output numbers in units of 1000 (with a character suffix for larger +units\ \-\- see below). +.IP 3. +output numbers in units of 1024. +.RE +.IP +The default is human-readable level 1. Each \fB\-h\fP option increases the +level by one. You can take the level down to 0 (to output numbers as pure +digits) by specifying the \fB\-\-no-human-readable\fP (\fB\-\-no-h\fP) option. +.IP +The unit letters that are appended in levels 2 and 3 are: \fBK\fP (kilo), \fBM\fP +(mega), \fBG\fP (giga), \fBT\fP (tera), or \fBP\fP (peta). For example, a 1234567-byte +file would output as 1.23M in level-2 (assuming that a period is your local +decimal point). +.IP +Backward compatibility note: versions of rsync prior to 3.1.0 do not +support human-readable level 1, and they default to level 0. Thus, +specifying one or two \fB\-h\fP options will behave in a comparable manner in +old and new versions as long as you didn't specify a \fB\-\-no-h\fP option prior +to one or more \fB\-h\fP options. See the \fB\-\-list-only\fP option for one +difference. +.IP "\fB\-\-partial\fP" +By default, rsync will delete any partially transferred file if the +transfer is interrupted. In some circumstances it is more desirable to +keep partially transferred files. Using the \fB\-\-partial\fP option tells rsync +to keep the partial file which should make a subsequent transfer of the +rest of the file much faster. +.IP "\fB\-\-partial-dir=DIR\fP" +This option modifies the behavior of the \fB\-\-partial\fP option while +also implying that it be enabled. This enhanced partial-file method puts +any partially transferred files into the specified \fIDIR\fP instead of writing +the partial file out to the destination file. On the next transfer, rsync +will use a file found in this dir as data to speed up the resumption of the +transfer and then delete it after it has served its purpose. +.IP +Note that if \fB\-\-whole-file\fP is specified (or implied), any +partial-dir files that are found for a file that is being updated will +simply be removed (since rsync is sending files without using rsync's +delta-transfer algorithm). +.IP +Rsync will create the \fIDIR\fP if it is missing, but just the last dir\ \-\- not +the whole path. This makes it easy to use a relative path (such as +"\fB\-\-partial-dir=.rsync-partial\fP") to have rsync create the +partial-directory in the destination file's directory when it is needed, +and then remove it again when the partial file is deleted. Note that this +directory removal is only done for a relative pathname, as it is expected +that an absolute path is to a directory that is reserved for partial-dir +work. +.IP +If the partial-dir value is not an absolute path, rsync will add an exclude +rule at the end of all your existing excludes. This will prevent the +sending of any partial-dir files that may exist on the sending side, and +will also prevent the untimely deletion of partial-dir items on the +receiving side. An example: the above \fB\-\-partial-dir\fP option would add the +equivalent of this "perishable" exclude at the end of any other filter +rules: \fB\-f\ '\-p\ .rsync-partial/'\fP +.IP +If you are supplying your own exclude rules, you may need to add your own +exclude/hide/protect rule for the partial-dir because: +.RS +.IP +.IP 1. +the auto-added rule may be ineffective at the end of your other rules, or +.IP 2. +you may wish to override rsync's exclude choice. +.RE +.IP +For instance, if you want to make rsync clean-up any left-over partial-dirs +that may be lying around, you should specify \fB\-\-delete-after\fP and +add a "risk" filter rule, e.g. \fB\-f\ 'R\ .rsync-partial/'\fP. Avoid using +\fB\-\-delete-before\fP or \fB\-\-delete-during\fP unless you don't +need rsync to use any of the left-over partial-dir data during the current +run. +.IP +IMPORTANT: the \fB\-\-partial-dir\fP should not be writable by other users or it +is a security risk! E.g. AVOID "/tmp"! +.IP +You can also set the partial-dir value the \fBRSYNC_PARTIAL_DIR\fP +environment variable. Setting this in the environment does not force +\fB\-\-partial\fP to be enabled, but rather it affects where partial +files go when \fB\-\-partial\fP is specified. For instance, instead of +using \fB\-\-partial-dir=.rsync-tmp\fP along with \fB\-\-progress\fP, you could +set \fBRSYNC_PARTIAL_DIR=.rsync-tmp\fP in your environment and then use +the \fB\-P\fP option to turn on the use of the .rsync-tmp dir for +partial transfers. The only times that the \fB\-\-partial\fP option does +not look for this environment value are: +.RS +.IP +.IP 1. +when \fB\-\-inplace\fP was specified (since \fB\-\-inplace\fP +conflicts with \fB\-\-partial-dir\fP), and +.IP 2. +when \fB\-\-delay-updates\fP was specified (see below). +.RE +.IP +When a modern rsync resumes the transfer of a file in the partial-dir, that +partial file is now updated in-place instead of creating yet another +tmp-file copy (so it maxes out at dest + tmp instead of dest + partial + +tmp). This requires both ends of the transfer to be at least version +3.2.0. +.IP +For the purposes of the daemon-config's "\fBrefuse\ options\fP" setting, +\fB\-\-partial-dir\fP does \fInot\fP imply \fB\-\-partial\fP. This is so that a +refusal of the \fB\-\-partial\fP option can be used to disallow the +overwriting of destination files with a partial transfer, while still +allowing the safer idiom provided by \fB\-\-partial-dir\fP. +.IP "\fB\-\-delay-updates\fP" +This option puts the temporary file from each updated file into a holding +directory until the end of the transfer, at which time all the files are +renamed into place in rapid succession. This attempts to make the updating +of the files a little more atomic. By default the files are placed into a +directory named \fB.~tmp~\fP in each file's destination directory, but if +you've specified the \fB\-\-partial-dir\fP option, that directory will be +used instead. See the comments in the \fB\-\-partial-dir\fP section for +a discussion of how this \fB.~tmp~\fP dir will be excluded from the transfer, +and what you can do if you want rsync to cleanup old \fB.~tmp~\fP dirs that +might be lying around. Conflicts with \fB\-\-inplace\fP and +\fB\-\-append\fP. +.IP +This option implies \fB\-\-no-inc-recursive\fP since it needs the full +file list in memory in order to be able to iterate over it at the end. +.IP +This option uses more memory on the receiving side (one bit per file +transferred) and also requires enough free disk space on the receiving side +to hold an additional copy of all the updated files. Note also that you +should not use an absolute path to \fB\-\-partial-dir\fP unless: +.RS +.IP +.IP 1. +there is no chance of any of the files in the transfer having the same +name (since all the updated files will be put into a single directory if +the path is absolute), and +.IP 2. +there are no mount points in the hierarchy (since the delayed updates +will fail if they can't be renamed into place). +.RE +.IP +See also the "atomic-rsync" python script in the "support" subdir for an +update algorithm that is even more atomic (it uses \fB\-\-link-dest\fP +and a parallel hierarchy of files). +.IP "\fB\-\-prune-empty-dirs\fP, \fB\-m\fP" +This option tells the receiving rsync to get rid of empty directories from +the file-list, including nested directories that have no non-directory +children. This is useful for avoiding the creation of a bunch of useless +directories when the sending rsync is recursively scanning a hierarchy of +files using include/exclude/filter rules. +.IP +This option can still leave empty directories on the receiving side if you +make use of TRANSFER_RULES. +.IP +Because the file-list is actually being pruned, this option also affects +what directories get deleted when a delete is active. However, keep in +mind that excluded files and directories can prevent existing items from +being deleted due to an exclude both hiding source files and protecting +destination files. See the perishable filter-rule option for how to avoid +this. +.IP +You can prevent the pruning of certain empty directories from the file-list +by using a global "protect" filter. For instance, this option would ensure +that the directory "emptydir" was kept in the file-list: +.RS 4 +.IP +.nf +--filter 'protect emptydir/' +.fi +.RE +.IP +Here's an example that copies all .pdf files in a hierarchy, only creating +the necessary destination directories to hold the .pdf files, and ensures +that any superfluous files and directories in the destination are removed +(note the hide filter of non-directories being used instead of an exclude): +.RS 4 +.IP +.nf +rsync -avm --del --include='*.pdf' -f 'hide,! */' src/ dest +.fi +.RE +.IP +If you didn't want to remove superfluous destination files, the more +time-honored options of \fB\-\-include='*/'\ \-\-exclude='*'\fP would work +fine in place of the hide-filter (if that is more natural to you). +.IP "\fB\-\-progress\fP" +This option tells rsync to print information showing the progress of the +transfer. This gives a bored user something to watch. With a modern rsync +this is the same as specifying \fB\-\-info=flist2,name,progress\fP, but +any user-supplied settings for those info flags takes precedence (e.g. +\fB\-\-info=flist0\ \-\-progress\fP). +.IP +While rsync is transferring a regular file, it updates a progress line that +looks like this: +.RS 4 +.IP +.nf +782448 63% 110.64kB/s 0:00:04 +.fi +.RE +.IP +In this example, the receiver has reconstructed 782448 bytes or 63% of the +sender's file, which is being reconstructed at a rate of 110.64 kilobytes +per second, and the transfer will finish in 4 seconds if the current rate +is maintained until the end. +.IP +These statistics can be misleading if rsync's delta-transfer algorithm is +in use. For example, if the sender's file consists of the basis file +followed by additional data, the reported rate will probably drop +dramatically when the receiver gets to the literal data, and the transfer +will probably take much longer to finish than the receiver estimated as it +was finishing the matched part of the file. +.IP +When the file transfer finishes, rsync replaces the progress line with a +summary line that looks like this: +.RS 4 +.IP +.nf +1,238,099 100% 146.38kB/s 0:00:08 (xfr#5, to-chk=169/396) +.fi +.RE +.IP +In this example, the file was 1,238,099 bytes long in total, the average +rate of transfer for the whole file was 146.38 kilobytes per second over +the 8 seconds that it took to complete, it was the 5th transfer of a +regular file during the current rsync session, and there are 169 more files +for the receiver to check (to see if they are up-to-date or not) remaining +out of the 396 total files in the file-list. +.IP +In an incremental recursion scan, rsync won't know the total number of +files in the file-list until it reaches the ends of the scan, but since it +starts to transfer files during the scan, it will display a line with the +text "ir-chk" (for incremental recursion check) instead of "to-chk" until +the point that it knows the full size of the list, at which point it will +switch to using "to-chk". Thus, seeing "ir-chk" lets you know that the +total count of files in the file list is still going to increase (and each +time it does, the count of files left to check will increase by the number +of the files added to the list). +.IP "\fB\-P\fP" +The \fB\-P\fP option is equivalent to "\fB\-\-partial\fP +\fB\-\-progress\fP". Its purpose is to make it much easier to specify +these two options for a long transfer that may be interrupted. +.IP +There is also a \fB\-\-info=progress2\fP option that outputs statistics +based on the whole transfer, rather than individual files. Use this flag +without outputting a filename (e.g. avoid \fB\-v\fP or specify +\fB\-\-info=name0\fP) if you want to see how the transfer is doing +without scrolling the screen with a lot of names. (You don't need to +specify the \fB\-\-progress\fP option in order to use +\fB\-\-info=progress2\fP.) +.IP +Finally, you can get an instant progress report by sending rsync a signal +of either SIGINFO or SIGVTALRM. On BSD systems, a SIGINFO is generated by +typing a Ctrl+T (Linux doesn't currently support a SIGINFO signal). When +the client-side process receives one of those signals, it sets a flag to +output a single progress report which is output when the current file +transfer finishes (so it may take a little time if a big file is being +handled when the signal arrives). A filename is output (if needed) +followed by the \fB\-\-info=progress2\fP format of progress info. If you +don't know which of the 3 rsync processes is the client process, it's OK to +signal all of them (since the non-client processes ignore the signal). +.IP +CAUTION: sending SIGVTALRM to an older rsync (pre-3.2.0) will kill it. +.IP "\fB\-\-password-file=FILE\fP" +This option allows you to provide a password for accessing an rsync daemon +via a file or via standard input if \fBFILE\fP is \fB\-\fP. The file should +contain just the password on the first line (all other lines are ignored). +Rsync will exit with an error if \fBFILE\fP is world readable or if a +root-run rsync command finds a non-root-owned file. +.IP +This option does not supply a password to a remote shell transport such as +ssh; to learn how to do that, consult the remote shell's documentation. +When accessing an rsync daemon using a remote shell as the transport, this +option only comes into effect after the remote shell finishes its +authentication (i.e. if you have also specified a password in the daemon's +config file). +.IP "\fB\-\-early-input=FILE\fP" +This option allows rsync to send up to 5K of data to the "early exec" +script on its stdin. One possible use of this data is to give the script a +secret that can be used to mount an encrypted filesystem (which you should +unmount in the the "post-xfer exec" script). +.IP +The daemon must be at least version 3.2.1. +.IP "\fB\-\-list-only\fP" +This option will cause the source files to be listed instead of +transferred. This option is inferred if there is a single source arg and +no destination specified, so its main uses are: +.RS +.IP +.IP 1. +to turn a copy command that includes a destination arg into a +file-listing command, or +.IP 2. +to be able to specify more than one source arg. Note: be sure to +include the destination. +.RE +.IP +CAUTION: keep in mind that a source arg with a wild-card is expanded by the +shell into multiple args, so it is never safe to try to specify a single +wild-card arg to try to infer this option. A safe example is: +.RS 4 +.IP +.nf +rsync -av --list-only foo* dest/ +.fi +.RE +.IP +This option always uses an output format that looks similar to this: +.RS 4 +.IP +.nf +drwxrwxr-x 4,096 2022/09/30 12:53:11 support +-rw-rw-r-- 80 2005/01/11 10:37:37 support/Makefile +.fi +.RE +.IP +The only option that affects this output style is (as of 3.1.0) the +\fB\-\-human-readable\fP (\fB\-h\fP) option. The default is to output sizes +as byte counts with digit separators (in a 14-character-width column). +Specifying at least one \fB\-h\fP option makes the sizes output with unit +suffixes. If you want old-style bytecount sizes without digit separators +(and an 11-character-width column) use \fB\-\-no-h\fP. +.IP +Compatibility note: when requesting a remote listing of files from an rsync +that is version 2.6.3 or older, you may encounter an error if you ask for a +non-recursive listing. This is because a file listing implies the +\fB\-\-dirs\fP option w/o \fB\-\-recursive\fP, and older rsyncs don't +have that option. To avoid this problem, either specify the \fB\-\-no-dirs\fP +option (if you don't need to expand a directory's content), or turn on +recursion and exclude the content of subdirectories: \fB\-r\ \-\-exclude='/*/*'\fP. +.IP "\fB\-\-bwlimit=RATE\fP" +This option allows you to specify the maximum transfer rate for the data +sent over the socket, specified in units per second. The RATE value can be +suffixed with a string to indicate a size multiplier, and may be a +fractional value (e.g. \fB\-\-bwlimit=1.5m\fP). If no suffix is specified, the +value will be assumed to be in units of 1024 bytes (as if "K" or "KiB" had +been appended). See the \fB\-\-max-size\fP option for a description of +all the available suffixes. A value of 0 specifies no limit. +.IP +For backward-compatibility reasons, the rate limit will be rounded to the +nearest KiB unit, so no rate smaller than 1024 bytes per second is +possible. +.IP +Rsync writes data over the socket in blocks, and this option both limits +the size of the blocks that rsync writes, and tries to keep the average +transfer rate at the requested limit. Some burstiness may be seen where +rsync writes out a block of data and then sleeps to bring the average rate +into compliance. +.IP +Due to the internal buffering of data, the \fB\-\-progress\fP option may +not be an accurate reflection on how fast the data is being sent. This is +because some files can show up as being rapidly sent when the data is +quickly buffered, while other can show up as very slow when the flushing of +the output buffer occurs. This may be fixed in a future version. +.IP +See also the daemon version of the \fB\-\-bwlimit\fP option. +.IP "\fB\-\-stop-after=MINS\fP, (\fB\-\-time-limit=MINS\fP)" +This option tells rsync to stop copying when the specified number of +minutes has elapsed. +.IP +For maximal flexibility, rsync does not communicate this option to the +remote rsync since it is usually enough that one side of the connection +quits as specified. This allows the option's use even when only one side +of the connection supports it. You can tell the remote side about the time +limit using \fB\-\-remote-option\fP (\fB\-M\fP), should the need arise. +.IP +The \fB\-\-time-limit\fP version of this option is deprecated. +.IP "\fB\-\-stop-at=y-m-dTh:m\fP" +This option tells rsync to stop copying when the specified point in time +has been reached. The date & time can be fully specified in a numeric +format of year-month-dayThour:minute (e.g. 2000-12-31T23:59) in the local +timezone. You may choose to separate the date numbers using slashes +instead of dashes. +.IP +The value can also be abbreviated in a variety of ways, such as specifying +a 2-digit year and/or leaving off various values. In all cases, the value +will be taken to be the next possible point in time where the supplied +information matches. If the value specifies the current time or a past +time, rsync exits with an error. +.IP +For example, "1-30" specifies the next January 30th (at midnight local +time), "14:00" specifies the next 2 P.M., "1" specifies the next 1st of the +month at midnight, "31" specifies the next month where we can stop on its +31st day, and ":59" specifies the next 59th minute after the hour. +.IP +For maximal flexibility, rsync does not communicate this option to the +remote rsync since it is usually enough that one side of the connection +quits as specified. This allows the option's use even when only one side +of the connection supports it. You can tell the remote side about the time +limit using \fB\-\-remote-option\fP (\fB\-M\fP), should the need arise. Do +keep in mind that the remote host may have a different default timezone +than your local host. +.IP "\fB\-\-fsync\fP" +Cause the receiving side to fsync each finished file. This may slow down +the transfer, but can help to provide peace of mind when updating critical +files. +.IP "\fB\-\-write-batch=FILE\fP" +Record a file that can later be applied to another identical destination +with \fB\-\-read-batch\fP. See the "BATCH MODE" section for details, and +also the \fB\-\-only-write-batch\fP option. +.IP +This option overrides the negotiated checksum & compress lists and always +negotiates a choice based on old-school md5/md4/zlib choices. If you want +a more modern choice, use the \fB\-\-checksum-choice\fP (\fB\-\-cc\fP) and/or +\fB\-\-compress-choice\fP (\fB\-\-zc\fP) options. +.IP "\fB\-\-only-write-batch=FILE\fP" +Works like \fB\-\-write-batch\fP, except that no updates are made on the +destination system when creating the batch. This lets you transport the +changes to the destination system via some other means and then apply the +changes via \fB\-\-read-batch\fP. +.IP +Note that you can feel free to write the batch directly to some portable +media: if this media fills to capacity before the end of the transfer, you +can just apply that partial transfer to the destination and repeat the +whole process to get the rest of the changes (as long as you don't mind a +partially updated destination system while the multi-update cycle is +happening). +.IP +Also note that you only save bandwidth when pushing changes to a remote +system because this allows the batched data to be diverted from the sender +into the batch file without having to flow over the wire to the receiver +(when pulling, the sender is remote, and thus can't write the batch). +.IP "\fB\-\-read-batch=FILE\fP" +Apply all of the changes stored in FILE, a file previously generated by +\fB\-\-write-batch\fP. If \fIFILE\fP is \fB\-\fP, the batch data will be read +from standard input. See the "BATCH MODE" section for details. +.IP "\fB\-\-protocol=NUM\fP" +Force an older protocol version to be used. This is useful for creating a +batch file that is compatible with an older version of rsync. For +instance, if rsync 2.6.4 is being used with the \fB\-\-write-batch\fP +option, but rsync 2.6.3 is what will be used to run the +\fB\-\-read-batch\fP option, you should use "\-\-protocol=28" when creating +the batch file to force the older protocol version to be used in the batch +file (assuming you can't upgrade the rsync on the reading system). +.IP "\fB\-\-iconv=CONVERT_SPEC\fP" +Rsync can convert filenames between character sets using this option. +Using a CONVERT_SPEC of "." tells rsync to look up the default +character-set via the locale setting. Alternately, you can fully specify +what conversion to do by giving a local and a remote charset separated by a +comma in the order \fB\-\-iconv=LOCAL,REMOTE\fP, e.g. \fB\-\-iconv=utf8,iso88591\fP. +This order ensures that the option will stay the same whether you're +pushing or pulling files. Finally, you can specify either \fB\-\-no-iconv\fP or +a CONVERT_SPEC of "\-" to turn off any conversion. The default setting of +this option is site-specific, and can also be affected via the +\fBRSYNC_ICONV\fP environment variable. +.IP +For a list of what charset names your local iconv library supports, you can +run "\fBiconv\ \-\-list\fP". +.IP +If you specify the \fB\-\-secluded-args\fP (\fB\-s\fP) option, rsync will +translate the filenames you specify on the command-line that are being sent +to the remote host. See also the \fB\-\-files-from\fP option. +.IP +Note that rsync does not do any conversion of names in filter files +(including include/exclude files). It is up to you to ensure that you're +specifying matching rules that can match on both sides of the transfer. +For instance, you can specify extra include/exclude rules if there are +filename differences on the two sides that need to be accounted for. +.IP +When you pass an \fB\-\-iconv\fP option to an rsync daemon that allows it, the +daemon uses the charset specified in its "charset" configuration parameter +regardless of the remote charset you actually pass. Thus, you may feel +free to specify just the local charset for a daemon transfer (e.g. +\fB\-\-iconv=utf8\fP). +.IP "\fB\-\-ipv4\fP, \fB\-4\fP or \fB\-\-ipv6\fP, \fB\-6\fP" +Tells rsync to prefer IPv4/IPv6 when creating sockets or running ssh. This +affects sockets that rsync has direct control over, such as the outgoing +socket when directly contacting an rsync daemon, as well as the forwarding +of the \fB\-4\fP or \fB\-6\fP option to ssh when rsync can deduce that ssh is being +used as the remote shell. For other remote shells you'll need to specify +the "\fB\-\-rsh\ SHELL\ \-4\fP" option directly (or whatever IPv4/IPv6 hint options +it uses). +.IP +See also the daemon version of these options. +.IP +If rsync was compiled without support for IPv6, the \fB\-\-ipv6\fP option will +have no effect. The \fBrsync\ \-\-version\fP output will contain "\fBno\ IPv6\fP" if +is the case. +.IP "\fB\-\-checksum-seed=NUM\fP" +Set the checksum seed to the integer NUM. This 4 byte checksum seed is +included in each block and MD4 file checksum calculation (the more modern +MD5 file checksums don't use a seed). By default the checksum seed is +generated by the server and defaults to the current \fBtime\fP(). This +option is used to set a specific checksum seed, which is useful for +applications that want repeatable block checksums, or in the case where the +user wants a more random checksum seed. Setting NUM to 0 causes rsync to +use the default of \fBtime\fP() for checksum seed. +.P +.SH "DAEMON OPTIONS" +.P +The options allowed when starting an rsync daemon are as follows: +.P +.IP "\fB\-\-daemon\fP" +This tells rsync that it is to run as a daemon. The daemon you start +running may be accessed using an rsync client using the \fBhost::module\fP or +\fBrsync://host/module/\fP syntax. +.IP +If standard input is a socket then rsync will assume that it is being run +via inetd, otherwise it will detach from the current terminal and become a +background daemon. The daemon will read the config file (rsyncd.conf) on +each connect made by a client and respond to requests accordingly. +.IP +See the \fBrsyncd.conf\fP(5) manpage for more details. +.IP "\fB\-\-address=ADDRESS\fP" +By default rsync will bind to the wildcard address when run as a daemon +with the \fB\-\-daemon\fP option. The \fB\-\-address\fP option allows you to specify a +specific IP address (or hostname) to bind to. This makes virtual hosting +possible in conjunction with the \fB\-\-config\fP option. +.IP +See also the address global option in the +rsyncd.conf manpage and the client version of the \fB\-\-address\fP +option. +.IP "\fB\-\-bwlimit=RATE\fP" +This option allows you to specify the maximum transfer rate for the data +the daemon sends over the socket. The client can still specify a smaller +\fB\-\-bwlimit\fP value, but no larger value will be allowed. +.IP +See the client version of the \fB\-\-bwlimit\fP option for some +extra details. +.IP "\fB\-\-config=FILE\fP" +This specifies an alternate config file than the default. This is only +relevant when \fB\-\-daemon\fP is specified. The default is +/etc/rsyncd.conf unless the daemon is running over a remote shell program +and the remote user is not the super-user; in that case the default is +rsyncd.conf in the current directory (typically $HOME). +.IP "\fB\-\-dparam=OVERRIDE\fP, \fB\-M\fP" +This option can be used to set a daemon-config parameter when starting up +rsync in daemon mode. It is equivalent to adding the parameter at the end +of the global settings prior to the first module's definition. The +parameter names can be specified without spaces, if you so desire. For +instance: +.RS 4 +.IP +.nf +rsync --daemon -M pidfile=/path/rsync.pid +.fi +.RE +.IP "\fB\-\-no-detach\fP" +When running as a daemon, this option instructs rsync to not detach itself +and become a background process. This option is required when running as a +service on Cygwin, and may also be useful when rsync is supervised by a +program such as \fBdaemontools\fP or AIX's \fBSystem\ Resource\ Controller\fP. +\fB\-\-no-detach\fP is also recommended when rsync is run under a debugger. This +option has no effect if rsync is run from inetd or sshd. +.IP "\fB\-\-port=PORT\fP" +This specifies an alternate TCP port number for the daemon to listen on +rather than the default of 873. +.IP +See also the client version of the \fB\-\-port\fP option and the +port global setting in the rsyncd.conf manpage. +.IP "\fB\-\-log-file=FILE\fP" +This option tells the rsync daemon to use the given log-file name instead +of using the "\fBlog\ file\fP" setting in the config file. +.IP +See also the client version of the \fB\-\-log-file\fP option. +.IP "\fB\-\-log-file-format=FORMAT\fP" +This option tells the rsync daemon to use the given FORMAT string instead +of using the "\fBlog\ format\fP" setting in the config file. It also enables +"\fBtransfer\ logging\fP" unless the string is empty, in which case transfer +logging is turned off. +.IP +See also the client version of the \fB\-\-log-file-format\fP +option. +.IP "\fB\-\-sockopts\fP" +This overrides the \fBsocket\ options\fP +setting in the rsyncd.conf file and has the same syntax. +.IP +See also the client version of the \fB\-\-sockopts\fP option. +.IP "\fB\-\-verbose\fP, \fB\-v\fP" +This option increases the amount of information the daemon logs during its +startup phase. After the client connects, the daemon's verbosity level +will be controlled by the options that the client used and the +"\fBmax\ verbosity\fP" setting in the module's config section. +.IP +See also the client version of the \fB\-\-verbose\fP option. +.IP "\fB\-\-ipv4\fP, \fB\-4\fP or \fB\-\-ipv6\fP, \fB\-6\fP" +Tells rsync to prefer IPv4/IPv6 when creating the incoming sockets that the +rsync daemon will use to listen for connections. One of these options may +be required in older versions of Linux to work around an IPv6 bug in the +kernel (if you see an "address already in use" error when nothing else is +using the port, try specifying \fB\-\-ipv6\fP or \fB\-\-ipv4\fP when starting the +daemon). +.IP +See also the client version of these options. +.IP +If rsync was compiled without support for IPv6, the \fB\-\-ipv6\fP option will +have no effect. The \fBrsync\ \-\-version\fP output will contain "\fBno\ IPv6\fP" if +is the case. +.IP "\fB\-\-help\fP, \fB\-h\fP" +When specified after \fB\-\-daemon\fP, print a short help page describing the +options available for starting an rsync daemon. +.P +.SH "FILTER RULES" +.P +The filter rules allow for custom control of several aspects of how files are +handled: +.P +.IP o +Control which files the sending side puts into the file list that describes +the transfer hierarchy +.IP o +Control which files the receiving side protects from deletion when the file +is not in the sender's file list +.IP o +Control which extended attribute names are skipped when copying xattrs +.P +The rules are either directly specified via option arguments or they can be +read in from one or more files. The filter-rule files can even be a part of +the hierarchy of files being copied, affecting different parts of the tree in +different ways. +.P +.SS "SIMPLE INCLUDE/EXCLUDE RULES" +.P +We will first cover the basics of how include & exclude rules affect what files +are transferred, ignoring any deletion side-effects. Filter rules mainly +affect the contents of directories that rsync is "recursing" into, but they can +also affect a top-level item in the transfer that was specified as a argument. +.P +The default for any unmatched file/dir is for it to be included in the +transfer, which puts the file/dir into the sender's file list. The use of an +exclude rule causes one or more matching files/dirs to be left out of the +sender's file list. An include rule can be used to limit the effect of an +exclude rule that is matching too many files. +.P +The order of the rules is important because the first rule that matches is the +one that takes effect. Thus, if an early rule excludes a file, no include rule +that comes after it can have any effect. This means that you must place any +include overrides somewhere prior to the exclude that it is intended to limit. +.P +When a directory is excluded, all its contents and sub-contents are also +excluded. The sender doesn't scan through any of it at all, which can save a +lot of time when skipping large unneeded sub-trees. +.P +It is also important to understand that the include/exclude rules are applied +to every file and directory that the sender is recursing into. Thus, if you +want a particular deep file to be included, you have to make sure that none of +the directories that must be traversed on the way down to that file are +excluded or else the file will never be discovered to be included. As an +example, if the directory "\fBa/path\fP" was given as a transfer argument and you +want to ensure that the file "\fBa/path/down/deep/wanted.txt\fP" is a part of the +transfer, then the sender must not exclude the directories "\fBa/path\fP", +"\fBa/path/down\fP", or "\fBa/path/down/deep\fP" as it makes it way scanning through +the file tree. +.P +When you are working on the rules, it can be helpful to ask rsync to tell you +what is being excluded/included and why. Specifying \fB\-\-debug=FILTER\fP or (when +pulling files) \fB\-M\-\-debug=FILTER\fP turns on level 1 of the FILTER debug +information that will output a message any time that a file or directory is +included or excluded and which rule it matched. Beginning in 3.2.4 it will +also warn if a filter rule has trailing whitespace, since an exclude of "foo\ " +(with a trailing space) will not exclude a file named "foo". +.P +Exclude and include rules can specify wildcard PATTERN MATCHING RULES +(similar to shell wildcards) that allow you to match things like a file suffix +or a portion of a filename. +.P +A rule can be limited to only affecting a directory by putting a trailing slash +onto the filename. +.P +.SS "SIMPLE INCLUDE/EXCLUDE EXAMPLE" +.P +With the following file tree created on the sending side: +.RS 4 +.P +.nf +mkdir x/ +touch x/file.txt +mkdir x/y/ +touch x/y/file.txt +touch x/y/zzz.txt +mkdir x/z/ +touch x/z/file.txt +.fi +.RE +.P +Then the following rsync command will transfer the file "\fBx/y/file.txt\fP" and +the directories needed to hold it, resulting in the path "\fB/tmp/x/y/file.txt\fP" +existing on the remote host: +.RS 4 +.P +.nf +rsync -ai -f'+ x/' -f'+ x/y/' -f'+ x/y/file.txt' -f'- *' x host:/tmp/ +.fi +.RE +.P +Aside: this copy could also have been accomplished using the \fB\-R\fP +option (though the 2 commands behave differently if deletions are enabled): +.RS 4 +.P +.nf +rsync -aiR x/y/file.txt host:/tmp/ +.fi +.RE +.P +The following command does not need an include of the "x" directory because it +is not a part of the transfer (note the traililng slash). Running this command +would copy just "\fB/tmp/x/file.txt\fP" because the "y" and "z" dirs get excluded: +.RS 4 +.P +.nf +rsync -ai -f'+ file.txt' -f'- *' x/ host:/tmp/x/ +.fi +.RE +.P +This command would omit the zzz.txt file while copying "x" and everything else +it contains: +.RS 4 +.P +.nf +rsync -ai -f'- zzz.txt' x host:/tmp/ +.fi +.RE +.P +.SS "FILTER RULES WHEN DELETING" +.P +By default the include & exclude filter rules affect both the sender +(as it creates its file list) +and the receiver (as it creates its file lists for calculating deletions). If +no delete option is in effect, the receiver skips creating the delete-related +file lists. This two-sided default can be manually overridden so that you are +only specifying sender rules or receiver rules, as described in the FILTER +RULES IN DEPTH section. +.P +When deleting, an exclude protects a file from being removed on the receiving +side while an include overrides that protection (putting the file at risk of +deletion). The default is for a file to be at risk\ \-\- its safety depends on it +matching a corresponding file from the sender. +.P +An example of the two-sided exclude effect can be illustrated by the copying of +a C development directory between 2 systems. When doing a touch-up copy, you +might want to skip copying the built executable and the \fB.o\fP files (sender +hide) so that the receiving side can build their own and not lose any object +files that are already correct (receiver protect). For instance: +.RS 4 +.P +.nf +rsync -ai --del -f'- *.o' -f'- cmd' src host:/dest/ +.fi +.RE +.P +Note that using \fB\-f'\-p\ *.o'\fP is even better than \fB\-f'\-\ *.o'\fP if there is a +chance that the directory structure may have changed. The "p" modifier is +discussed in FILTER RULE MODIFIERS. +.P +One final note, if your shell doesn't mind unexpanded wildcards, you could +simplify the typing of the filter options by using an underscore in place of +the space and leaving off the quotes. For instance, \fB\-f\ \-_*.o\ \-f\ \-_cmd\fP (and +similar) could be used instead of the filter options above. +.P +.SS "FILTER RULES IN DEPTH" +.P +Rsync supports old-style include/exclude rules and new-style filter rules. The +older rules are specified using \fB\-\-include\fP and \fB\-\-exclude\fP as +well as the \fB\-\-include-from\fP and \fB\-\-exclude-from\fP. These are +limited in behavior but they don't require a "\-" or "+" prefix. An old-style +exclude rule is turned into a "\fB\-\ name\fP" filter rule (with no modifiers) and an +old-style include rule is turned into a "\fB+\ name\fP" filter rule (with no +modifiers). +.P +Rsync builds an ordered list of filter rules as specified on the command-line +and/or read-in from files. New style filter rules have the following syntax: +.RS 4 +.P +.nf +RULE [PATTERN_OR_FILENAME] +RULE,MODIFIERS [PATTERN_OR_FILENAME] +.fi +.RE +.P +You have your choice of using either short or long RULE names, as described +below. If you use a short-named rule, the ',' separating the RULE from the +MODIFIERS is optional. The PATTERN or FILENAME that follows (when present) +must come after either a single space or an underscore (_). Any additional +spaces and/or underscores are considered to be a part of the pattern name. +Here are the available rule prefixes: +.P +.IP "\fBexclude,\ '\-'\fP" +specifies an exclude pattern that (by default) is both a +\fBhide\fP and a \fBprotect\fP. +.IP "\fBinclude,\ '+'\fP" +specifies an include pattern that (by default) is both a +\fBshow\fP and a \fBrisk\fP. +.IP "\fBmerge,\ '.'\fP" +specifies a merge-file on the client side to read for more +rules. +.IP "\fBdir-merge,\ ':'\fP" +specifies a per-directory merge-file. Using this kind of +filter rule requires that you trust the sending side's filter checking, so +it has the side-effect mentioned under the \fB\-\-trust-sender\fP option. +.IP "\fBhide,\ 'H'\fP" +specifies a pattern for hiding files from the transfer. +Equivalent to a sender-only exclude, so \fB\-f'H\ foo'\fP could also be specified +as \fB\-f'\-s\ foo'\fP. +.IP "\fBshow,\ 'S'\fP" +files that match the pattern are not hidden. Equivalent to a +sender-only include, so \fB\-f'S\ foo'\fP could also be specified as \fB\-f'+s\ foo'\fP. +.IP "\fBprotect,\ 'P'\fP" +specifies a pattern for protecting files from deletion. +Equivalent to a receiver-only exclude, so \fB\-f'P\ foo'\fP could also be +specified as \fB\-f'\-r\ foo'\fP. +.IP "\fBrisk,\ 'R'\fP" +files that match the pattern are not protected. Equivalent to a +receiver-only include, so \fB\-f'R\ foo'\fP could also be specified as \fB\-f'+r\ foo'\fP. +.IP "\fBclear,\ '!'\fP" +clears the current include/exclude list (takes no arg) +.P +When rules are being read from a file (using merge or dir-merge), empty lines +are ignored, as are whole-line comments that start with a '\fB#\fP' (filename rules +that contain a hash character are unaffected). +.P +Note also that the \fB\-\-filter\fP, \fB\-\-include\fP, and +\fB\-\-exclude\fP options take one rule/pattern each. To add multiple ones, +you can repeat the options on the command-line, use the merge-file syntax of +the \fB\-\-filter\fP option, or the \fB\-\-include-from\fP / +\fB\-\-exclude-from\fP options. +.P +.SS "PATTERN MATCHING RULES" +.P +Most of the rules mentioned above take an argument that specifies what the rule +should match. If rsync is recursing through a directory hierarchy, keep in +mind that each pattern is matched against the name of every directory in the +descent path as rsync finds the filenames to send. +.P +The matching rules for the pattern argument take several forms: +.P +.IP o +If a pattern contains a \fB/\fP (not counting a trailing slash) or a "\fB**\fP" +(which can match a slash), then the pattern is matched against the full +pathname, including any leading directories within the transfer. If the +pattern doesn't contain a (non-trailing) \fB/\fP or a "\fB**\fP", then it is matched +only against the final component of the filename or pathname. For example, +\fBfoo\fP means that the final path component must be "foo" while \fBfoo/bar\fP would +match the last 2 elements of the path (as long as both elements are within +the transfer). +.IP o +A pattern that ends with a \fB/\fP only matches a directory, not a regular file, +symlink, or device. +.IP o +A pattern that starts with a \fB/\fP is anchored to the start of the transfer +path instead of the end. For example, \fB/foo/**\fP or \fB/foo/bar/**\fP match only +leading elements in the path. If the rule is read from a per-directory +filter file, the transfer path being matched will begin at the level of the +filter file instead of the top of the transfer. See the section on +ANCHORING INCLUDE/EXCLUDE PATTERNS for a full discussion of how to +specify a pattern that matches at the root of the transfer. +.P +Rsync chooses between doing a simple string match and wildcard matching by +checking if the pattern contains one of these three wildcard characters: '\fB*\fP', +\&'\fB?\fP', and '\fB[\fP' : +.P +.IP o +a '\fB?\fP' matches any single character except a slash (\fB/\fP). +.IP o +a '\fB*\fP' matches zero or more non-slash characters. +.IP o +a '\fB**\fP' matches zero or more characters, including slashes. +.IP o +a '\fB[\fP' introduces a character class, such as \fB[a-z]\fP or \fB[[:alpha:]]\fP, that +must match one character. +.IP o +a trailing \fB***\fP in the pattern is a shorthand that allows you to match a +directory and all its contents using a single rule. For example, specifying +"\fBdir_name/***\fP" will match both the "dir_name" directory (as if "\fBdir_name/\fP" +had been specified) and everything in the directory (as if "\fBdir_name/**\fP" +had been specified). +.IP o +a backslash can be used to escape a wildcard character, but it is only +interpreted as an escape character if at least one wildcard character is +present in the match pattern. For instance, the pattern "\fBfoo\\bar\fP" matches +that single backslash literally, while the pattern "\fBfoo\\bar*\fP" would need to +be changed to "\fBfoo\\\\bar*\fP" to avoid the "\fB\\b\fP" becoming just "b". +.P +Here are some examples of exclude/include matching: +.P +.IP o +Option \fB\-f'\-\ *.o'\fP would exclude all filenames ending with \fB.o\fP +.IP o +Option \fB\-f'\-\ /foo'\fP would exclude a file (or directory) named foo in the +transfer-root directory +.IP o +Option \fB\-f'\-\ foo/'\fP would exclude any directory named foo +.IP o +Option \fB\-f'\-\ foo/*/bar'\fP would exclude any file/dir named bar which is at two +levels below a directory named foo (if foo is in the transfer) +.IP o +Option \fB\-f'\-\ /foo/**/bar'\fP would exclude any file/dir named bar that was two +or more levels below a top-level directory named foo (note that /foo/bar is +\fBnot\fP excluded by this) +.IP o +Options \fB\-f'+\ */'\ \-f'+\ *.c'\ \-f'\-\ *'\fP would include all directories and .c +source files but nothing else +.IP o +Options \fB\-f'+\ foo/'\ \-f'+\ foo/bar.c'\ \-f'\-\ *'\fP would include only the foo +directory and foo/bar.c (the foo directory must be explicitly included or it +would be excluded by the "\fB\-\ *\fP") +.P +.SS "FILTER RULE MODIFIERS" +.P +The following modifiers are accepted after an include (+) or exclude (\-) rule: +.P +.IP o +A \fB/\fP specifies that the include/exclude rule should be matched against the +absolute pathname of the current item. For example, \fB\-f'\-/\ /etc/passwd'\fP +would exclude the passwd file any time the transfer was sending files from +the "/etc" directory, and "\-/ subdir/foo" would always exclude "foo" when it +is in a dir named "subdir", even if "foo" is at the root of the current +transfer. +.IP o +A \fB!\fP specifies that the include/exclude should take effect if the pattern +fails to match. For instance, \fB\-f'\-!\ */'\fP would exclude all non-directories. +.IP o +A \fBC\fP is used to indicate that all the global CVS-exclude rules should be +inserted as excludes in place of the "\-C". No arg should follow. +.IP o +An \fBs\fP is used to indicate that the rule applies to the sending side. When a +rule affects the sending side, it affects what files are put into the +sender's file list. The default is for a rule to affect both sides unless +\fB\-\-delete-excluded\fP was specified, in which case default rules become +sender-side only. See also the hide (H) and show (S) rules, which are an +alternate way to specify sending-side includes/excludes. +.IP o +An \fBr\fP is used to indicate that the rule applies to the receiving side. When +a rule affects the receiving side, it prevents files from being deleted. See +the \fBs\fP modifier for more info. See also the protect (P) and risk (R) rules, +which are an alternate way to specify receiver-side includes/excludes. +.IP o +A \fBp\fP indicates that a rule is perishable, meaning that it is ignored in +directories that are being deleted. For instance, the +\fB\-\-cvs-exclude\fP (\fB\-C\fP) option's default rules that exclude things +like "CVS" and "\fB*.o\fP" are marked as perishable, and will not prevent a +directory that was removed on the source from being deleted on the +destination. +.IP o +An \fBx\fP indicates that a rule affects xattr names in xattr copy/delete +operations (and is thus ignored when matching file/dir names). If no +xattr-matching rules are specified, a default xattr filtering rule is used +(see the \fB\-\-xattrs\fP option). +.P +.SS "MERGE-FILE FILTER RULES" +.P +You can merge whole files into your filter rules by specifying either a merge +(.) or a dir-merge (:) filter rule (as introduced in the FILTER RULES +section above). +.P +There are two kinds of merged files\ \-\- single-instance ('.') and per-directory +(':'). A single-instance merge file is read one time, and its rules are +incorporated into the filter list in the place of the "." rule. For +per-directory merge files, rsync will scan every directory that it traverses +for the named file, merging its contents when the file exists into the current +list of inherited rules. These per-directory rule files must be created on the +sending side because it is the sending side that is being scanned for the +available files to transfer. These rule files may also need to be transferred +to the receiving side if you want them to affect what files don't get deleted +(see PER-DIRECTORY RULES AND DELETE below). +.P +Some examples: +.RS 4 +.P +.nf +merge /etc/rsync/default.rules +\&. /etc/rsync/default.rules +dir-merge .per-dir-filter +dir-merge,n- .non-inherited-per-dir-excludes +:n- .non-inherited-per-dir-excludes +.fi +.RE +.P +The following modifiers are accepted after a merge or dir-merge rule: +.P +.IP o +A \fB\-\fP specifies that the file should consist of only exclude patterns, with +no other rule-parsing except for in-file comments. +.IP o +A \fB+\fP specifies that the file should consist of only include patterns, with +no other rule-parsing except for in-file comments. +.IP o +A \fBC\fP is a way to specify that the file should be read in a CVS-compatible +manner. This turns on 'n', 'w', and '\-', but also allows the list-clearing +token (!) to be specified. If no filename is provided, ".cvsignore" is +assumed. +.IP o +A \fBe\fP will exclude the merge-file name from the transfer; e.g. "dir-merge,e +\&.rules" is like "dir-merge .rules" and "\- .rules". +.IP o +An \fBn\fP specifies that the rules are not inherited by subdirectories. +.IP o +A \fBw\fP specifies that the rules are word-split on whitespace instead of the +normal line-splitting. This also turns off comments. Note: the space that +separates the prefix from the rule is treated specially, so "\- foo + bar" is +parsed as two rules (assuming that prefix-parsing wasn't also disabled). +.IP o +You may also specify any of the modifiers for the "+" or "\-" rules (above) in +order to have the rules that are read in from the file default to having that +modifier set (except for the \fB!\fP modifier, which would not be useful). For +instance, "merge,\-/ .excl" would treat the contents of .excl as absolute-path +excludes, while "dir-merge,s .filt" and ":sC" would each make all their +per-directory rules apply only on the sending side. If the merge rule +specifies sides to affect (via the \fBs\fP or \fBr\fP modifier or both), then the +rules in the file must not specify sides (via a modifier or a rule prefix +such as \fBhide\fP). +.P +Per-directory rules are inherited in all subdirectories of the directory where +the merge-file was found unless the 'n' modifier was used. Each subdirectory's +rules are prefixed to the inherited per-directory rules from its parents, which +gives the newest rules a higher priority than the inherited rules. The entire +set of dir-merge rules are grouped together in the spot where the merge-file +was specified, so it is possible to override dir-merge rules via a rule that +got specified earlier in the list of global rules. When the list-clearing rule +("!") is read from a per-directory file, it only clears the inherited rules for +the current merge file. +.P +Another way to prevent a single rule from a dir-merge file from being inherited +is to anchor it with a leading slash. Anchored rules in a per-directory +merge-file are relative to the merge-file's directory, so a pattern "/foo" +would only match the file "foo" in the directory where the dir-merge filter +file was found. +.P +Here's an example filter file which you'd specify via \fB\-\-filter=".\ file":\fP +.RS 4 +.P +.nf +merge /home/user/.global-filter +- *.gz +dir-merge .rules ++ *.[ch] +- *.o +- foo* +.fi +.RE +.P +This will merge the contents of the /home/user/.global-filter file at the start +of the list and also turns the ".rules" filename into a per-directory filter +file. All rules read in prior to the start of the directory scan follow the +global anchoring rules (i.e. a leading slash matches at the root of the +transfer). +.P +If a per-directory merge-file is specified with a path that is a parent +directory of the first transfer directory, rsync will scan all the parent dirs +from that starting point to the transfer directory for the indicated +per-directory file. For instance, here is a common filter (see \fB\-F\fP): +.RS 4 +.P +.nf +--filter=': /.rsync-filter' +.fi +.RE +.P +That rule tells rsync to scan for the file .rsync-filter in all directories +from the root down through the parent directory of the transfer prior to the +start of the normal directory scan of the file in the directories that are sent +as a part of the transfer. (Note: for an rsync daemon, the root is always the +same as the module's "path".) +.P +Some examples of this pre-scanning for per-directory files: +.RS 4 +.P +.nf +rsync -avF /src/path/ /dest/dir +rsync -av --filter=': ../../.rsync-filter' /src/path/ /dest/dir +rsync -av --filter=': .rsync-filter' /src/path/ /dest/dir +.fi +.RE +.P +The first two commands above will look for ".rsync-filter" in "/" and "/src" +before the normal scan begins looking for the file in "/src/path" and its +subdirectories. The last command avoids the parent-dir scan and only looks for +the ".rsync-filter" files in each directory that is a part of the transfer. +.P +If you want to include the contents of a ".cvsignore" in your patterns, you +should use the rule ":C", which creates a dir-merge of the .cvsignore file, but +parsed in a CVS-compatible manner. You can use this to affect where the +\fB\-\-cvs-exclude\fP (\fB\-C\fP) option's inclusion of the per-directory +\&.cvsignore file gets placed into your rules by putting the ":C" wherever you +like in your filter rules. Without this, rsync would add the dir-merge rule +for the .cvsignore file at the end of all your other rules (giving it a lower +priority than your command-line rules). For example: +.RS 4 +.P +.nf +cat <<EOT | rsync -avC --filter='. -' a/ b ++ foo.o +:C +- *.old +EOT +rsync -avC --include=foo.o -f :C --exclude='*.old' a/ b +.fi +.RE +.P +Both of the above rsync commands are identical. Each one will merge all the +per-directory .cvsignore rules in the middle of the list rather than at the +end. This allows their dir-specific rules to supersede the rules that follow +the :C instead of being subservient to all your rules. To affect the other CVS +exclude rules (i.e. the default list of exclusions, the contents of +$HOME/.cvsignore, and the value of $CVSIGNORE) you should omit the \fB\-C\fP +command-line option and instead insert a "\-C" rule into your filter rules; e.g. +"\fB\-\-filter=\-C\fP". +.P +.SS "LIST-CLEARING FILTER RULE" +.P +You can clear the current include/exclude list by using the "!" filter rule (as +introduced in the FILTER RULES section above). The "current" list is either +the global list of rules (if the rule is encountered while parsing the filter +options) or a set of per-directory rules (which are inherited in their own +sub-list, so a subdirectory can use this to clear out the parent's rules). +.P +.SS "ANCHORING INCLUDE/EXCLUDE PATTERNS" +.P +As mentioned earlier, global include/exclude patterns are anchored at the "root +of the transfer" (as opposed to per-directory patterns, which are anchored at +the merge-file's directory). If you think of the transfer as a subtree of +names that are being sent from sender to receiver, the transfer-root is where +the tree starts to be duplicated in the destination directory. This root +governs where patterns that start with a / match. +.P +Because the matching is relative to the transfer-root, changing the trailing +slash on a source path or changing your use of the \fB\-\-relative\fP option +affects the path you need to use in your matching (in addition to changing how +much of the file tree is duplicated on the destination host). The following +examples demonstrate this. +.P +Let's say that we want to match two source files, one with an absolute +path of "/home/me/foo/bar", and one with a path of "/home/you/bar/baz". +Here is how the various command choices differ for a 2-source transfer: +.RS 4 +.P +.nf +Example cmd: rsync -a /home/me /home/you /dest ++/- pattern: /me/foo/bar ++/- pattern: /you/bar/baz +Target file: /dest/me/foo/bar +Target file: /dest/you/bar/baz +.fi +.RE +.RS 4 +.P +.nf +Example cmd: rsync -a /home/me/ /home/you/ /dest ++/- pattern: /foo/bar (note missing "me") ++/- pattern: /bar/baz (note missing "you") +Target file: /dest/foo/bar +Target file: /dest/bar/baz +.fi +.RE +.RS 4 +.P +.nf +Example cmd: rsync -a --relative /home/me/ /home/you /dest ++/- pattern: /home/me/foo/bar (note full path) ++/- pattern: /home/you/bar/baz (ditto) +Target file: /dest/home/me/foo/bar +Target file: /dest/home/you/bar/baz +.fi +.RE +.RS 4 +.P +.nf +Example cmd: cd /home; rsync -a --relative me/foo you/ /dest ++/- pattern: /me/foo/bar (starts at specified path) ++/- pattern: /you/bar/baz (ditto) +Target file: /dest/me/foo/bar +Target file: /dest/you/bar/baz +.fi +.RE +.P +The easiest way to see what name you should filter is to just look at the +output when using \fB\-\-verbose\fP and put a / in front of the name (use the +\fB\-\-dry-run\fP option if you're not yet ready to copy any files). +.P +.SS "PER-DIRECTORY RULES AND DELETE" +.P +Without a delete option, per-directory rules are only relevant on the sending +side, so you can feel free to exclude the merge files themselves without +affecting the transfer. To make this easy, the 'e' modifier adds this exclude +for you, as seen in these two equivalent commands: +.RS 4 +.P +.nf +rsync -av --filter=': .excl' --exclude=.excl host:src/dir /dest +rsync -av --filter=':e .excl' host:src/dir /dest +.fi +.RE +.P +However, if you want to do a delete on the receiving side AND you want some +files to be excluded from being deleted, you'll need to be sure that the +receiving side knows what files to exclude. The easiest way is to include the +per-directory merge files in the transfer and use \fB\-\-delete-after\fP, +because this ensures that the receiving side gets all the same exclude rules as +the sending side before it tries to delete anything: +.RS 4 +.P +.nf +rsync -avF --delete-after host:src/dir /dest +.fi +.RE +.P +However, if the merge files are not a part of the transfer, you'll need to +either specify some global exclude rules (i.e. specified on the command line), +or you'll need to maintain your own per-directory merge files on the receiving +side. An example of the first is this (assume that the remote .rules files +exclude themselves): +.RS 4 +.P +.nf +rsync -av --filter=': .rules' --filter='. /my/extra.rules' + --delete host:src/dir /dest +.fi +.RE +.P +In the above example the extra.rules file can affect both sides of the +transfer, but (on the sending side) the rules are subservient to the rules +merged from the .rules files because they were specified after the +per-directory merge rule. +.P +In one final example, the remote side is excluding the .rsync-filter files from +the transfer, but we want to use our own .rsync-filter files to control what +gets deleted on the receiving side. To do this we must specifically exclude +the per-directory merge files (so that they don't get deleted) and then put +rules into the local files to control what else should not get deleted. Like +one of these commands: +.RS 4 +.P +.nf +rsync -av --filter=':e /.rsync-filter' --delete \\ + host:src/dir /dest +rsync -avFF --delete host:src/dir /dest +.fi +.RE +.P +.SH "TRANSFER RULES" +.P +In addition to the FILTER RULES that affect the recursive file scans that +generate the file list on the sending and (when deleting) receiving sides, +there are transfer rules. These rules affect which files the generator decides +need to be transferred without the side effects of an exclude filter rule. +Transfer rules affect only files and never directories. +.P +Because a transfer rule does not affect what goes into the sender's (and +receiver's) file list, it cannot have any effect on which files get deleted on +the receiving side. For example, if the file "foo" is present in the sender's +list but its size is such that it is omitted due to a transfer rule, the +receiving side does not request the file. However, its presence in the file +list means that a delete pass will not remove a matching file named "foo" on +the receiving side. On the other hand, a server-side exclude (hide) of the +file "foo" leaves the file out of the server's file list, and absent a +receiver-side exclude (protect) the receiver will remove a matching file named +"foo" if deletions are requested. +.P +Given that the files are still in the sender's file list, the +\fB\-\-prune-empty-dirs\fP option will not judge a directory as being empty +even if it contains only files that the transfer rules omitted. +.P +Similarly, a transfer rule does not have any extra effect on which files are +deleted on the receiving side, so setting a maximum file size for the transfer +does not prevent big files from being deleted. +.P +Examples of transfer rules include the default "quick check" algorithm (which +compares size & modify time), the \fB\-\-update\fP option, the +\fB\-\-max-size\fP option, the \fB\-\-ignore-non-existing\fP option, and a +few others. +.P +.SH "BATCH MODE" +.P +Batch mode can be used to apply the same set of updates to many identical +systems. Suppose one has a tree which is replicated on a number of hosts. Now +suppose some changes have been made to this source tree and those changes need +to be propagated to the other hosts. In order to do this using batch mode, +rsync is run with the write-batch option to apply the changes made to the +source tree to one of the destination trees. The write-batch option causes the +rsync client to store in a "batch file" all the information needed to repeat +this operation against other, identical destination trees. +.P +Generating the batch file once saves having to perform the file status, +checksum, and data block generation more than once when updating multiple +destination trees. Multicast transport protocols can be used to transfer the +batch update files in parallel to many hosts at once, instead of sending the +same data to every host individually. +.P +To apply the recorded changes to another destination tree, run rsync with the +read-batch option, specifying the name of the same batch file, and the +destination tree. Rsync updates the destination tree using the information +stored in the batch file. +.P +For your convenience, a script file is also created when the write-batch option +is used: it will be named the same as the batch file with ".sh" appended. This +script file contains a command-line suitable for updating a destination tree +using the associated batch file. It can be executed using a Bourne (or +Bourne-like) shell, optionally passing in an alternate destination tree +pathname which is then used instead of the original destination path. This is +useful when the destination tree path on the current host differs from the one +used to create the batch file. +.P +Examples: +.RS 4 +.P +.nf +$ rsync --write-batch=foo -a host:/source/dir/ /adest/dir/ +$ scp foo* remote: +$ ssh remote ./foo.sh /bdest/dir/ +.fi +.RE +.RS 4 +.P +.nf +$ rsync --write-batch=foo -a /source/dir/ /adest/dir/ +$ ssh remote rsync --read-batch=- -a /bdest/dir/ <foo +.fi +.RE +.P +In these examples, rsync is used to update /adest/dir/ from /source/dir/ and +the information to repeat this operation is stored in "foo" and "foo.sh". The +host "remote" is then updated with the batched data going into the directory +/bdest/dir. The differences between the two examples reveals some of the +flexibility you have in how you deal with batches: +.P +.IP o +The first example shows that the initial copy doesn't have to be local\ \-\- you +can push or pull data to/from a remote host using either the remote-shell +syntax or rsync daemon syntax, as desired. +.IP o +The first example uses the created "foo.sh" file to get the right rsync +options when running the read-batch command on the remote host. +.IP o +The second example reads the batch data via standard input so that the batch +file doesn't need to be copied to the remote machine first. This example +avoids the foo.sh script because it needed to use a modified +\fB\-\-read-batch\fP option, but you could edit the script file if you +wished to make use of it (just be sure that no other option is trying to use +standard input, such as the \fB\-\-exclude-from=\-\fP option). +.P +Caveats: +.P +The read-batch option expects the destination tree that it is updating to be +identical to the destination tree that was used to create the batch update +fileset. When a difference between the destination trees is encountered the +update might be discarded with a warning (if the file appears to be up-to-date +already) or the file-update may be attempted and then, if the file fails to +verify, the update discarded with an error. This means that it should be safe +to re-run a read-batch operation if the command got interrupted. If you wish +to force the batched-update to always be attempted regardless of the file's +size and date, use the \fB\-I\fP option (when reading the batch). If an +error occurs, the destination tree will probably be in a partially updated +state. In that case, rsync can be used in its regular (non-batch) mode of +operation to fix up the destination tree. +.P +The rsync version used on all destinations must be at least as new as the one +used to generate the batch file. Rsync will die with an error if the protocol +version in the batch file is too new for the batch-reading rsync to handle. +See also the \fB\-\-protocol\fP option for a way to have the creating rsync +generate a batch file that an older rsync can understand. (Note that batch +files changed format in version 2.6.3, so mixing versions older than that with +newer versions will not work.) +.P +When reading a batch file, rsync will force the value of certain options to +match the data in the batch file if you didn't set them to the same as the +batch-writing command. Other options can (and should) be changed. For +instance \fB\-\-write-batch\fP changes to \fB\-\-read-batch\fP, +\fB\-\-files-from\fP is dropped, and the \fB\-\-filter\fP / +\fB\-\-include\fP / \fB\-\-exclude\fP options are not needed unless one of +the \fB\-\-delete\fP options is specified. +.P +The code that creates the BATCH.sh file transforms any filter/include/exclude +options into a single list that is appended as a "here" document to the shell +script file. An advanced user can use this to modify the exclude list if a +change in what gets deleted by \fB\-\-delete\fP is desired. A normal user +can ignore this detail and just use the shell script as an easy way to run the +appropriate \fB\-\-read-batch\fP command for the batched data. +.P +The original batch mode in rsync was based on "rsync+", but the latest +version uses a new implementation. +.P +.SH "SYMBOLIC LINKS" +.P +Three basic behaviors are possible when rsync encounters a symbolic +link in the source directory. +.P +By default, symbolic links are not transferred at all. A message "skipping +non-regular" file is emitted for any symlinks that exist. +.P +If \fB\-\-links\fP is specified, then symlinks are added to the transfer +(instead of being noisily ignored), and the default handling is to recreate +them with the same target on the destination. Note that \fB\-\-archive\fP +implies \fB\-\-links\fP. +.P +If \fB\-\-copy-links\fP is specified, then symlinks are "collapsed" by +copying their referent, rather than the symlink. +.P +Rsync can also distinguish "safe" and "unsafe" symbolic links. An example +where this might be used is a web site mirror that wishes to ensure that the +rsync module that is copied does not include symbolic links to \fB/etc/passwd\fP in +the public section of the site. Using \fB\-\-copy-unsafe-links\fP will cause +any links to be copied as the file they point to on the destination. Using +\fB\-\-safe-links\fP will cause unsafe links to be omitted by the receiver. +(Note that you must specify or imply \fB\-\-links\fP for +\fB\-\-safe-links\fP to have any effect.) +.P +Symbolic links are considered unsafe if they are absolute symlinks (start with +\fB/\fP), empty, or if they contain enough ".." components to ascend from the top +of the transfer. +.P +Here's a summary of how the symlink options are interpreted. The list is in +order of precedence, so if your combination of options isn't mentioned, use the +first line that is a complete subset of your options: +.P +.IP "\fB\-\-copy-links\fP" +Turn all symlinks into normal files and directories +(leaving no symlinks in the transfer for any other options to affect). +.IP "\fB\-\-copy-dirlinks\fP" +Turn just symlinks to directories into real +directories, leaving all other symlinks to be handled as described below. +.IP "\fB\-\-links\ \-\-copy-unsafe-links\fP" +Turn all unsafe symlinks +into files and create all safe symlinks. +.IP "\fB\-\-copy-unsafe-links\fP" +Turn all unsafe symlinks into files, noisily +skip all safe symlinks. +.IP "\fB\-\-links\ \-\-safe-links\fP" +The receiver skips creating +unsafe symlinks found in the transfer and creates the safe ones. +.IP "\fB\-\-links\fP" +Create all symlinks. +.P +For the effect of \fB\-\-munge-links\fP, see the discussion in that option's +section. +.P +Note that the \fB\-\-keep-dirlinks\fP option does not effect symlinks in the +transfer but instead affects how rsync treats a symlink to a directory that +already exists on the receiving side. See that option's section for a warning. +.P +.SH "DIAGNOSTICS" +.P +Rsync occasionally produces error messages that may seem a little cryptic. The +one that seems to cause the most confusion is "protocol version mismatch\ \-\- is +your shell clean?". +.P +This message is usually caused by your startup scripts or remote shell facility +producing unwanted garbage on the stream that rsync is using for its transport. +The way to diagnose this problem is to run your remote shell like this: +.RS 4 +.P +.nf +ssh remotehost /bin/true > out.dat +.fi +.RE +.P +then look at out.dat. If everything is working correctly then out.dat should +be a zero length file. If you are getting the above error from rsync then you +will probably find that out.dat contains some text or data. Look at the +contents and try to work out what is producing it. The most common cause is +incorrectly configured shell startup scripts (such as .cshrc or .profile) that +contain output statements for non-interactive logins. +.P +If you are having trouble debugging filter patterns, then try specifying the +\fB\-vv\fP option. At this level of verbosity rsync will show why each individual +file is included or excluded. +.P +.SH "EXIT VALUES" +.P +.IP o +\fB0\fP \- Success +.IP o +\fB1\fP \- Syntax or usage error +.IP o +\fB2\fP \- Protocol incompatibility +.IP o +\fB3\fP \- Errors selecting input/output files, dirs +.IP o +.P +.RS +.IP o +\fB4\fP \- Requested action not supported. Either: + +an attempt was made to manipulate 64-bit files on a platform that cannot support them +.IP o +an option was specified that is supported by the client and not by the server +.RE +.IP o +\fB5\fP \- Error starting client-server protocol +.IP o +\fB6\fP \- Daemon unable to append to log-file +.IP o +\fB10\fP \- Error in socket I/O +.IP o +\fB11\fP \- Error in file I/O +.IP o +\fB12\fP \- Error in rsync protocol data stream +.IP o +\fB13\fP \- Errors with program diagnostics +.IP o +\fB14\fP \- Error in IPC code +.IP o +\fB20\fP \- Received SIGUSR1 or SIGINT +.IP o +\fB21\fP \- Some error returned by \fBwaitpid()\fP +.IP o +\fB22\fP \- Error allocating core memory buffers +.IP o +\fB23\fP \- Partial transfer due to error +.IP o +\fB24\fP \- Partial transfer due to vanished source files +.IP o +\fB25\fP \- The \-\-max-delete limit stopped deletions +.IP o +\fB30\fP \- Timeout in data send/receive +.IP o +\fB35\fP \- Timeout waiting for daemon connection +.P +.SH "ENVIRONMENT VARIABLES" +.P +.IP "\fBCVSIGNORE\fP" +The CVSIGNORE environment variable supplements any ignore patterns in +\&.cvsignore files. See the \fB\-\-cvs-exclude\fP option for more details. +.IP "\fBRSYNC_ICONV\fP" +Specify a default \fB\-\-iconv\fP setting using this environment +variable. First supported in 3.0.0. +.IP "\fBRSYNC_OLD_ARGS\fP" +Specify a "1" if you want the \fB\-\-old-args\fP option to be enabled by +default, a "2" (or more) if you want it to be enabled in the +repeated-option state, or a "0" to make sure that it is disabled by +default. When this environment variable is set to a non-zero value, it +supersedes the \fBRSYNC_PROTECT_ARGS\fP variable. +.IP +This variable is ignored if \fB\-\-old-args\fP, \fB\-\-no-old-args\fP, or +\fB\-\-secluded-args\fP is specified on the command line. +.IP +First supported in 3.2.4. +.IP "\fBRSYNC_PROTECT_ARGS\fP" +Specify a non-zero numeric value if you want the \fB\-\-secluded-args\fP +option to be enabled by default, or a zero value to make sure that it is +disabled by default. +.IP +This variable is ignored if \fB\-\-secluded-args\fP, \fB\-\-no-secluded-args\fP, +or \fB\-\-old-args\fP is specified on the command line. +.IP +First supported in 3.1.0. Starting in 3.2.4, this variable is ignored if +\fBRSYNC_OLD_ARGS\fP is set to a non-zero value. +.IP "\fBRSYNC_RSH\fP" +This environment variable allows you to override the default shell used as +the transport for rsync. Command line options are permitted after the +command name, just as in the \fB\-\-rsh\fP (\fB\-e\fP) option. +.IP "\fBRSYNC_PROXY\fP" +This environment variable allows you to redirect your rsync +client to use a web proxy when connecting to an rsync daemon. You should +set \fBRSYNC_PROXY\fP to a hostname:port pair. +.IP "\fBRSYNC_PASSWORD\fP" +This environment variable allows you to set the password for an rsync +\fBdaemon\fP connection, which avoids the password prompt. Note that this +does \fBnot\fP supply a password to a remote shell transport such as ssh +(consult its documentation for how to do that). +.IP "\fBUSER\fP or \fBLOGNAME\fP" +The USER or LOGNAME environment variables are used to determine the default +username sent to an rsync daemon. If neither is set, the username defaults +to "nobody". If both are set, \fBUSER\fP takes precedence. +.IP "\fBRSYNC_PARTIAL_DIR\fP" +This environment variable specifies the directory to use for a +\fB\-\-partial\fP transfer without implying that partial transfers be +enabled. See the \fB\-\-partial-dir\fP option for full details. +.IP "\fBRSYNC_COMPRESS_LIST\fP" +This environment variable allows you to customize the negotiation of the +compression algorithm by specifying an alternate order or a reduced list of +names. Use the command \fBrsync\ \-\-version\fP to see the available compression +names. See the \fB\-\-compress\fP option for full details. +.IP "\fBRSYNC_CHECKSUM_LIST\fP" +This environment variable allows you to customize the negotiation of the +checksum algorithm by specifying an alternate order or a reduced list of +names. Use the command \fBrsync\ \-\-version\fP to see the available checksum +names. See the \fB\-\-checksum-choice\fP option for full details. +.IP "\fBRSYNC_MAX_ALLOC\fP" +This environment variable sets an allocation maximum as if you had used the +\fB\-\-max-alloc\fP option. +.IP "\fBRSYNC_PORT\fP" +This environment variable is not read by rsync, but is instead set in +its sub-environment when rsync is running the remote shell in combination +with a daemon connection. This allows a script such as +\fBrsync-ssl\fP to be able to know the port number that the user +specified on the command line. +.IP "\fBHOME\fP" +This environment variable is used to find the user's default .cvsignore +file. +.IP "\fBRSYNC_CONNECT_PROG\fP" +This environment variable is mainly used in debug setups to set the program +to use when making a daemon connection. See CONNECTING TO AN RSYNC +DAEMON for full details. +.IP "\fBRSYNC_SHELL\fP" +This environment variable is mainly used in debug setups to set the program +to use to run the program specified by \fBRSYNC_CONNECT_PROG\fP. See +CONNECTING TO AN RSYNC DAEMON for full details. +.P +.SH "FILES" +.P +/etc/rsyncd.conf or rsyncd.conf +.P +.SH "SEE ALSO" +.P +\fBrsync-ssl\fP(1), \fBrsyncd.conf\fP(5), \fBrrsync\fP(1) +.P +.SH "BUGS" +.P +.IP o +Times are transferred as *nix time_t values. +.IP o +When transferring to FAT filesystems rsync may re-sync unmodified files. See +the comments on the \fB\-\-modify-window\fP option. +.IP o +File permissions, devices, etc. are transferred as native numerical values. +.IP o +See also the comments on the \fB\-\-delete\fP option. +.P +Please report bugs! See the web site at https://rsync.samba.org/. +.P +.SH "VERSION" +.P +This manpage is current for version 3.2.7 of rsync. +.P +.SH "INTERNAL OPTIONS" +.P +The options \fB\-\-server\fP and \fB\-\-sender\fP are used internally by rsync, and should +never be typed by a user under normal circumstances. Some awareness of these +options may be needed in certain scenarios, such as when setting up a login +that can only run an rsync command. For instance, the support directory of the +rsync distribution has an example script named rrsync (for restricted rsync) +that can be used with a restricted ssh login. +.P +.SH "CREDITS" +.P +Rsync is distributed under the GNU General Public License. See the file +COPYING for details. +.P +An rsync web site is available at https://rsync.samba.org/. The site +includes an FAQ-O-Matic which may cover questions unanswered by this manual +page. +.P +The rsync github project is https://github.com/WayneD/rsync. +.P +We would be delighted to hear from you if you like this program. Please +contact the mailing-list at rsync@lists.samba.org. +.P +This program uses the excellent zlib compression library written by Jean-loup +Gailly and Mark Adler. +.P +.SH "THANKS" +.P +Special thanks go out to: John Van Essen, Matt McCutchen, Wesley W. Terpstra, +David Dykstra, Jos Backus, Sebastian Krahmer, Martin Pool, and our +gone-but-not-forgotten compadre, J.W. Schultz. +.P +Thanks also to Richard Brent, Brendan Mackay, Bill Waite, Stephen Rothwell and +David Bell. I've probably missed some people, my apologies if I have. +.P +.SH "AUTHOR" +.P +Rsync was originally written by Andrew Tridgell and Paul Mackerras. Many +people have later contributed to it. It is currently maintained by Wayne +Davison. +.P +Mailing lists for support and development are available at +https://lists.samba.org/. |