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ZUPDATE(1)			 User Commands			    ZUPDATE(1)

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

       zupdate [options] [files]

       zupdate	recompresses  files  from bzip2, gzip, xz, and zstd formats to
       lzip format. Each original is compared  with  the  new  file  and  then
       deleted.	 Only regular files with standard file name extensions are re-
       compressed, 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 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-

       '.bz2', '.gz', '.xz', or	'.zst',	which are recompressed to '.lz'.

       '.tbz', '.tbz2',	'.tgz',	'.txz',	or '.tzst', which are recompressed  to

       Exit  status  is	0 if all the compressed	files were successfully	recom-
       pressed (if needed), compared, and  deleted  (if	 requested).  Non-zero

       -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]

	      set compressor and options for bzip2 format

	      set compressor and options for gzip format

	      set compressor and options for lzip format

	      set compressor and options for xz	format

	      set compressor and options for zstd format

       Report bugs to
       Zutils home page:

       Copyright  (C) 2022 Antonio Diaz	Diaz.  License GPLv2+: GNU GPL version
       2 or later <>
       This is free software: you are free  to	change	and  redistribute  it.
       There is	NO WARRANTY, to	the extent permitted by	law.

       The  full  documentation	for zupdate is maintained as a Texinfo manual.
       If the info and zupdate programs	are properly installed at  your	 site,
       the command

	      info zutils

       should give you access to the complete manual.

zutils 1.11			 January 2022			    ZUPDATE(1)


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