ztest - check the integrity of compressed files

       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.

       ztest checks the integrity of the compressed files specified. It also warns if an uncompressed file has a
       compressed  file  name  extension, or if a compressed file has a wrong compressed extension. Uncompressed
       files are otherwise ignored. If a file is specified as '-', the integrity of compressed  data  read  from
       standard  input is checked. Data read from standard input must be all in the same compressed format. If a
       file fails to decompress, does not exist, can't be opened, or is a terminal, ztest continues testing  the
       rest  of the files. A final diagnostic is shown at verbosity level 1 or higher if any file fails the test
       when testing multiple files.

       If no files are specified, recursive searches examine the current  working  directory,  and  nonrecursive
       searches read standard input.

       The formats supported are bzip2, gzip, lzip, xz, and zstd.

       Note  that  error  detection in the xz format is broken. First, some xz files lack integrity information.
       Second, not all xz decompressors can check the integrity of all xz files. Third, section 2.1.1.2  'Stream
       Flags'  of  the xz format specification allows xz decompressors to produce garbage output without issuing
       any warning. Therefore, xz files can't always be checked as reliably as files in the other formats can.

       Exit status is 0 if all compressed files check OK, 1 if environmental problems (file not  found,  invalid
       command-line  options,  I/O  errors, etc), 2 if any compressed file is corrupt or invalid, or if any file
       has an incorrect file name extension.

       ztest - check the integrity of compressed files

-h, --help
              display this help and exit

       -V, --version
              output version information and exit

       -M, --format=<list>
              process only the formats in <list>

       -N, --no-rcfile
              don't read runtime configuration file

       -O, --force-format=<fmt>
              force the input format

       -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)

       --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 options '-M' and '-O' are 'bz2', 'gz', 'lz', 'xz', and 'zst'.

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

       The full documentation for ztest is maintained as a Texinfo manual.  If the info and ztest  programs  are
       properly installed at your site, the command

              infozutils

       should give you access to the complete manual.

zutils 1.14                                       January 2025                                          ZTEST(1)

ztest [options] [files]