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ZUPDATE(1)			 User Commands			    ZUPDATE(1)

NAME
       zupdate - recompress bzip2, gzip, xz files to lzip format

SYNOPSIS
       zupdate [options] [files]

DESCRIPTION
       zupdate	recompresses  files  from  bzip2, gzip,	and xz formats to lzip
       format. Each original is	compared with the new file and	then  deleted.
       Only regular files with standard	file name extensions are recompressed,
       other files are ignored.	Compressed files are decompressed and then re-
       compressed  on the fly; no temporary files are created. The lzip	format
       is chosen as  destination  because  it  is  the	most  appropriate  for
       long-term data archiving.

       If no files are specified, recursive searches examine the current work-
       ing directory, and nonrecursive searches	do nothing.

       If the lzip compressed version of a file	already	exists,	 the  file  is
       skipped unless the option '--force' 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 cause any data  loss.  Therefore,  existing  lzip  com-
       pressed files are never overwritten nor deleted.

       The  names  of the original files must have one of the following	exten-
       sions: '.bz2', '.gz',  or  '.xz',  which	 are  recompressed  to	'.lz';
       '.tbz', '.tbz2',	'.tgz',	or '.txz', which are recompressed to '.tlz'.

       Exit  status  is	0 if all the compressed	files were successfully	recom-
       pressed (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
	      don't skip a file	even if	the .lz	exists

       -k, --keep
	      keep (don't delete) input	files

       -l, --lzip-verbose
	      pass one option -v 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

       -R, --dereference-recursive
	      recursively follow symbolic links

       -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  (C) 2021 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.

zutils 1.10			 January 2021			    ZUPDATE(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | REPORTING BUGS | COPYRIGHT

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