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

NAME

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

SYNOPSIS

       zupdate [options] [files]

DESCRIPTION

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 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
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).

OPTIONS

       -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', 'lz', 'xz', and 'zst'.

REPORTING BUGS

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

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