ZUPDATE man page on DragonFly
[printable version]
ZUPDATE(1) User Commands ZUPDATE(1)
NAME
zupdate - recompress bzip2, gzip, xz files to lzip files
SYNOPSIS
zupdate [options] [files]
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 decom‐
pressed and then recompressed on the fly; no temporary files are cre‐
ated. The lzip format is chosen as destination because it is by far
the most appropriate for long-term data archiving.
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 com‐
parison 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 com‐
pressed files are never overwritten nor deleted.
Exit status is 0 if all the compressed files were successfully recom‐
pressed (if needed), compared and deleted (if requested). Non-zero oth‐
erwise.
OPTIONS
-h, --help
display this help and exit
-V, --version
output version information and exit
-f, --force
do not skip a file even if the .lz exists
-k, --keep
keep (don't delete) input files
-l, --lzip-verbose
pass a -v option to the lzip compressor
-M, --format=<list>
process only the formats in <list>
-N, --no-rcfile
don't read runtime configuration file
-q, --quiet
suppress all messages
-r, --recursive
operate recursively on directories
-v, --verbose
be verbose (a 2nd -v gives more)
-0 .. -9
set compression level [default 9]
--bz2=<command>
set compressor and options for bzip2 format
--gz=<command>
set compressor and options for gzip format
--lz=<command>
set compressor and options for lzip format
--xz=<command>
set compressor and options for xz format
REPORTING BUGS
Report bugs to zutils-bug@nongnu.org
Zutils home page: http://www.nongnu.org/zutils/zutils.html
COPYRIGHT
Copyright © 2015 Antonio Diaz Diaz. License GPLv2+: GNU GPL version 2
or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
zupdate (zutils) 1.4 May 2015 ZUPDATE(1)
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