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

       Copyright   ©   2025   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  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
       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 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 option  '--force'
       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  cause  any  data
       loss. Therefore, existing lzip-compressed files are never overwritten nor deleted.

       The names of the original files must have one of the following extensions:

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

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

       Exit  status  is  0 if all the compressed files were successfully recompressed (if needed), compared, and
       deleted (if requested). 1 if a non-fatal error occurred (file not found or not regular,  or  has  invalid
       format, or can't be deleted). 2 if a fatal error occurred (invalid command-line options, compressor can't
       be run, or comparison fails).

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

-h, --help
              display this help and exit

       -V, --version
              output version information and exit

       -d, --destdir=<dir>
              write recompressed files into <dir>

       -e, --expand-extensions
              expand combined extensions; tgz --> tar.lz

       -f, --force
              don't skip a file even if the .lz exists

       -i, --ignore-errors
              ignore non-fatal errors

       -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

       --zst=<command>
              set compressor and options for zstd format

       Valid formats for option '-M' are 'bz2', 'gz', 'xz', and 'zst'.

       Report bugs to zutils-bug@nongnu.org
       Zutils home page: http://www.nongnu.org/zutils/zutils.html

       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

              infozutils

       should give you access to the complete manual.

zutils 1.14                                       January 2025                                        ZUPDATE(1)

zupdate [options] [files]