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

       -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)