diff options
Diffstat (limited to 'misc-utils/logger.1.adoc')
| -rw-r--r-- | misc-utils/logger.1.adoc | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/misc-utils/logger.1.adoc b/misc-utils/logger.1.adoc new file mode 100644 index 0000000..7037fcb --- /dev/null +++ b/misc-utils/logger.1.adoc @@ -0,0 +1,258 @@ +//po4a: entry man manual +//// +Copyright (c) 1983, 1990, 1993 + The Regents of the University of California. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions +are met: +1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. +2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. +3. All advertising materials mentioning features or use of this software + must display the following acknowledgement: + This product includes software developed by the University of + California, Berkeley and its contributors. +4. Neither the name of the University nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +SUCH DAMAGE. + + @(#)logger.1 8.1 (Berkeley) 6/6/93 +//// += logger(1) +:doctype: manpage +:man manual: User Commands +:man source: util-linux {release-version} +:page-layout: base +:command: logger + +== NAME + +logger - enter messages into the system log + +== SYNOPSIS + +*logger* [options] _message_ + +== DESCRIPTION + +*logger* makes entries in the system log. + +When the optional _message_ argument is present, it is written to the log. If it is not present, and the *-f* option is not given either, then standard input is logged. + +== OPTIONS + +*-d*, *--udp*:: +Use datagrams (UDP) only. By default the connection is tried to the syslog port defined in _/etc/services_, which is often 514. ++ +See also *--server* and *--socket* to specify where to connect. + +*-e*, *--skip-empty*:: +Ignore empty lines when processing files. An empty line is defined to be a line without any characters. Thus a line consisting only of whitespace is NOT considered empty. Note that when the *--prio-prefix* option is specified, the priority is not part of the line. Thus an empty line in this mode is a line that does not have any characters after the priority prefix (e.g., *<13>*). + +*-f*, *--file* _file_:: +Log the contents of the specified _file_. This option cannot be combined with a command-line message. + +*-i*:: +Log the PID of the *logger* process with each line. + +*--id*[**=**__id__]:: +Log the PID of the *logger* process with each line. When the optional argument _id_ is specified, then it is used instead of the *logger* command's PID. The use of *--id=$$* (PPID) is recommended in scripts that send several messages. ++ +Note that the system logging infrastructure (for example *systemd* when listening on _/dev/log_) may follow local socket credentials to overwrite the PID specified in the message. *logger*(1) is able to set those socket credentials to the given _id_, but only if you have root permissions and a process with the specified PID exists, otherwise the socket credentials are not modified and the problem is silently ignored. + +*--journald*[**=**__file__]:: +Write a *systemd* journal entry. The entry is read from the given _file_, when specified, otherwise from standard input. Each line must begin with a field that is accepted by *journald*; see *systemd.journal-fields*(7) for details. The use of a MESSAGE_ID field is generally a good idea, as it makes finding entries easy. Examples: ++ +____ + logger --journald <<end + MESSAGE_ID=67feb6ffbaf24c5cbec13c008dd72309 + MESSAGE=The dogs bark, but the caravan goes on. + DOGS=bark + CARAVAN=goes on + end + + logger --journald=entry.txt +____ ++ +Notice that *--journald* will ignore values of other options, such as priority. If priority is needed it must be within input, and use PRIORITY field. The simple execution of *journalctl*(1) will display MESSAGE field. Use *journalctl --output json-pretty* to see rest of the fields. ++ +To include newlines in MESSAGE, specify MESSAGE several times. This is handled as a special case, other fields will be stored as an array in the journal if they appear multiple times. + +*--msgid* _msgid_:: +Sets the link:https://tools.ietf.org/html/rfc5424[RFC 5424] MSGID field. Note that the space character is not permitted inside of _msgid_. This option is only used if *--rfc5424* is specified as well; otherwise, it is silently ignored. + +*-n*, *--server* _server_:: +Write to the specified remote syslog _server_ instead of to the system log socket. Unless *--udp* or *--tcp* is specified, *logger* will first try to use UDP, but if this fails a TCP connection is attempted. + +*--no-act*:: +Causes everything to be done except for writing the log message to the system log, and removing the connection to the journal. This option can be used together with *--stderr* for testing purposes. + +*--octet-count*:: +Use the link:https://tools.ietf.org/html/rfc6587[RFC 6587] octet counting framing method for sending messages. When this option is not used, the default is no framing on UDP, and RFC6587 non-transparent framing (also known as octet stuffing) on TCP. + +*-P*, *--port* _port_:: +Use the specified _port_. When this option is not specified, the port defaults to *syslog* for udp and to *syslog-conn* for tcp connections. + +*-p*, *--priority* _priority_:: +Enter the message into the log with the specified _priority_. The priority may be specified numerically or as a _facility_._level_ pair. For example, *-p local3.info* logs the message as informational in the local3 facility. The default is *user.notice*. + +*--prio-prefix*:: +Look for a syslog prefix on every line read from standard input. This prefix is a decimal number within angle brackets that encodes both the facility and the level. The number is constructed by multiplying the facility by 8 and then adding the level. For example, *local0.info*, meaning facility=16 and level=6, becomes *<134>*. ++ +If the prefix contains no facility, the facility defaults to what is specified by the *-p* option. Similarly, if no prefix is provided, the line is logged using the _priority_ given with *-p*. ++ +This option doesn't affect a command-line message. + +*--rfc3164*:: +Use the link:https://tools.ietf.org/html/rfc3164[RFC 3164] BSD syslog protocol to submit messages to a remote server. + +*--rfc5424*[**=**__without__]:: +Use the link:https://tools.ietf.org/html/rfc5424[RFC 5424] syslog protocol to submit messages to a remote server. The optional _without_ argument can be a comma-separated list of the following values: *notq*, *notime*, *nohost*. ++ +The *notq* value suppresses the time-quality structured data from the submitted message. The time-quality information shows whether the local clock was synchronized plus the maximum number of microseconds the timestamp might be off. The time quality is also automatically suppressed when *--sd-id timeQuality* is specified. ++ +The *notime* value (which implies *notq*) suppresses the complete sender timestamp that is in ISO-8601 format, including microseconds and timezone. ++ +The *nohost* value suppresses *gethostname*(2) information from the message header. ++ +The RFC 5424 protocol has been the default for *logger* since version 2.26. + +*-s*, *--stderr*:: +Output the message to standard error as well as to the system log. + +*--sd-id* _name_[**@**__digits__]:: +Specifies a structured data element ID for an RFC 5424 message header. The option has to be used before *--sd-param* to introduce a new element. The number of structured data elements is unlimited. The ID (_name_ plus possibly **@**__digits__) is case-sensitive and uniquely identifies the type and purpose of the element. The same ID must not exist more than once in a message. The **@**__digits__ part is required for user-defined non-standardized IDs. ++ +*logger* currently generates the *timeQuality* standardized element only. RFC 5424 also describes the elements *origin* (with parameters *ip*, *enterpriseId*, *software* and *swVersion*) and *meta* (with parameters *sequenceId*, *sysUpTime* and *language*). These element IDs may be specified without the **@**__digits__ suffix. + +*--sd-param* _name_=_value_:: +Specifies a structured data element parameter, a name and value pair. The option has to be used after *--sd-id* and may be specified more than once for the same element. Note that the quotation marks around _value_ are required and must be escaped on the command line. ++ +.... + logger --rfc5424 --sd-id zoo@123 \ + --sd-param tiger="hungry" \ + --sd-param zebra="running" \ + --sd-id manager@123 \ + --sd-param onMeeting="yes" \ + "this is message" +.... +produces: ++ +*<13>1 2015-10-01T14:07:59.168662+02:00 ws kzak - - [timeQuality tzKnown="1" isSynced="1" syncAccuracy="218616"][zoo@123 tiger="hungry" zebra="running"][manager@123 onMeeting="yes"] this is message* + +*-S*, *--size* _size_:: +Sets the maximum permitted message size to _size_. The default is 1KiB characters, which is the limit traditionally used and specified in RFC 3164. With RFC 5424, this limit has become flexible. A good assumption is that RFC 5424 receivers can at least process 4KiB messages. ++ +Most receivers accept messages larger than 1KiB over any type of syslog protocol. As such, the *--size* option affects *logger* in all cases (not only when *--rfc5424* was used). ++ +Note: the message-size limit limits the overall message size, including the syslog header. Header sizes vary depending on the selected options and the hostname length. As a rule of thumb, headers are usually not longer than 50 to 80 characters. When selecting a maximum message size, it is important to ensure that the receiver supports the max size as well, otherwise messages may become truncated. Again, as a rule of thumb two to four KiB message size should generally be OK, whereas anything larger should be verified to work. + +*--socket-errors*[**=**__mode__]:: +Print errors about Unix socket connections. The _mode_ can be a value of *off*, *on*, or *auto*. When the mode is *auto*, then *logger* will detect if the init process is *systemd*(1), and if so assumption is made _/dev/log_ can be used early at boot. Other init systems lack of _/dev/log_ will not cause errors that is identical with messaging using *openlog*(3) system call. The *logger*(1) before version 2.26 used *openlog*(3), and hence was unable to detected loss of messages sent to Unix sockets. ++ +The default mode is *auto*. When errors are not enabled lost messages are not communicated and will result to successful exit status of *logger*(1) invocation. + +*-T*, *--tcp*:: +Use stream (TCP) only. By default the connection is tried to the _syslog-conn_ port defined in _/etc/services_, which is often _601_. ++ +See also *--server* and *--socket* to specify where to connect. + +*-t*, *--tag* _tag_:: +Mark every line to be logged with the specified _tag_. The default tag is the name of the user logged in on the terminal (or a user name based on effective user ID). + +*-u*, *--socket* _socket_:: +Write to the specified _socket_ instead of to the system log socket. + +*--*:: +End the argument list. This allows the _message_ to start with a hyphen (-). + +include::man-common/help-version.adoc[] + +== EXIT STATUS + +The *logger* utility exits 0 on success, and >0 if an error occurs. + +== FACILITIES AND LEVELS + +Valid facility names are: + +*auth* + +*authpriv* for security information of a sensitive nature + +*cron* + + +*daemon* + +*ftp* + +*kern* cannot be generated from userspace process, automatically converted to *user* + + +*lpr* + +*mail* + +*news* + +*syslog* + +*user* + +*uucp* + +*local0* + + to + +*local7* + +*security* deprecated synonym for *auth* + +Valid level names are: + +*emerg* + +*alert* + +*crit* + +*err* + +*warning* + +*notice* + +*info* + +*debug* + +*panic* deprecated synonym for *emerg* + +*error* deprecated synonym for *err* + +*warn* deprecated synonym for *warning* + + +For the priority order and intended purposes of these facilities and levels, see *syslog*(3). + +== CONFORMING TO + +The *logger* command is expected to be IEEE Std 1003.2 ("POSIX.2") compatible. + +== EXAMPLES +____ +logger System rebooted + +logger -p local0.notice -t HOSTIDM -f /dev/idmc + +logger -n loghost.example.com System rebooted +____ + +== AUTHORS + +The *logger* command was originally written by University of California in 1983-1993 and later rewritten by mailto:kzak@redhat.com[Karel Zak], mailto:rgerhards@adiscon.com[Rainer Gerhards], and mailto:kerolasa@iki.fi[Sami Kerola]. + +== SEE ALSO + +*journalctl*(1), +*syslog*(3), +*systemd.journal-fields*(7) + +include::man-common/bugreports.adoc[] + +include::man-common/footer.adoc[] + +ifdef::translation[] +include::man-common/translation.adoc[] +endif::[] |