.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
.TH ZUPDATE "1" "May 2016" "zupdate (zutils) 1.5" "User Commands"
.SH NAME
zupdate \- recompress bzip2, gzip, xz files to lzip format
.SH SYNOPSIS
.B zupdate
[\fI\,options\/\fR] [\fI\,files\/\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 with the existing lzip version 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 (if requested). 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
don't skip a file even if the .lz exists
.TP
\fB\-k\fR, \fB\-\-keep\fR
keep (don't delete) input files
.TP
\fB\-l\fR, \fB\-\-lzip\-verbose\fR
pass a \fB\-v\fR option to the lzip compressor
.TP
\fB\-M\fR, \fB\-\-format=\fR<list>
process only the formats in <list>
.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 2016 Antonio Diaz Diaz.
License GPLv2+: GNU GPL version 2 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.