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 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', '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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