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 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.
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.
Exit status is 0 if all the compressed files were successfully recompressed (if
needed), compared and deleted (if requested). Non-zero otherwise.
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
- -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 © 2014 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.