NAME

       ztest - verify the integrity of compressed files

SYNOPSIS

       ztest [options] [files]

DESCRIPTION

       ztest  verifies  the  integrity  of the compressed files specified.  Uncompressed files are ignored. If a
       file is specified as '-', the integrity of compressed data read from standard  input  is  verified.  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 verifying 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 verify 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 verified as reliably as files in the other formats can.

       Exit  status is 0 if all compressed files verify OK, 1 if environmental problems (file not found, invalid
       flags, I/O errors, etc), 2 if any compressed file is corrupt or invalid.

OPTIONS

       -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 format given (bz2, gz, lz, xz, zst)

       -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

REPORTING BUGS

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

COPYRIGHT

       Copyright   ©   2022   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.

SEE ALSO

       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

              info zutils

       should give you access to the complete manual.

zutils 1.11                                       January 2022                                          ZTEST(1)