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


       zupdate [options] [files]


       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


       -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]

              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


       Report bugs to
       Zutils home page:


       Copyright © 2014 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.

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