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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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