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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.37.1.
.TH ZUPDATE "1" "September 2013" "Zupdate (zutils) 1.2-pre2" "User Commands"
.SH NAME
Zupdate \- recompress bzip2, gzip, xz files to lzip files
.SH SYNOPSIS
.B zupdate
[\fIoptions\fR] [\fIfiles\fR]
.SH DESCRIPTION
Zupdate recompresses files from bzip2, gzip, and xz formats to lzip format.
The originals are compared with the new files and then deleted.
Only regular files with standard file name extensions are recompressed,
other files are ignored.
Compressed files are decompressed and then recompressed on the fly; no
temporary files are created.
The lzip format is chosen as destination because it is by far the most
appropriate for long\-term data archiving.
.PP
If the lzip compressed version of a file already exists, the file is
skipped unless the '\-\-force' option is given. In this case, if the
comparison fails, an error is returned and the original file is not
deleted. The operation of zupdate is meant to be safe and not produce
any data loss. Therefore, existing lzip compressed files are never
overwritten nor deleted.
.PP
Exit status is 0 if all the compressed files were successfully
recompressed (if needed), compared and deleted. Non\-zero otherwise.
.SH OPTIONS
.TP
\fB\-h\fR, \fB\-\-help\fR
display this help and exit
.TP
\fB\-V\fR, \fB\-\-version\fR
output version information and exit
.TP
\fB\-f\fR, \fB\-\-force\fR
do not skip a file even if the .lz exists
.TP
\fB\-l\fR, \fB\-\-lzip\-verbose\fR
pass a \fB\-v\fR option to the lzip compressor
.TP
\fB\-N\fR, \fB\-\-no\-rcfile\fR
don't read runtime configuration file
.TP
\fB\-q\fR, \fB\-\-quiet\fR
suppress all messages
.TP
\fB\-r\fR, \fB\-\-recursive\fR
operate recursively on directories
.TP
\fB\-v\fR, \fB\-\-verbose\fR
be verbose (a 2nd \fB\-v\fR gives more)
.TP
\fB\-0\fR .. \fB\-9\fR
set compression level [default 9]
.TP
\fB\-\-bz2=\fR<command>
set compressor and options for bzip2 format
.TP
\fB\-\-gz=\fR<command>
set compressor and options for gzip format
.TP
\fB\-\-lz=\fR<command>
set compressor and options for lzip format
.TP
\fB\-\-xz=\fR<command>
set compressor and options for xz format
.SH "REPORTING BUGS"
Report bugs to zutils\-bug@nongnu.org
.br
Zutils home page: http://www.nongnu.org/zutils/zutils.html
.SH COPYRIGHT
Copyright \(co 2013 Antonio Diaz Diaz.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
.br
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
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