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 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 working directory, and nonrecursive
       searches do nothing.

       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
              don't 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

       -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   ©   2019   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.