NAME

ztest - verify the integrity of compressed files

SYNOPSIS

ztest [ options] [files]

DESCRIPTION

Ztest verifies the integrity of the specified compressed files. Uncompressed files are ignored. If no files are specified, or 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 compression format.

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

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 given format (bz2, gz, lz, xz)

-q, --quiet: suppress all messages

-r, --recursive: operate recursively on directories

-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

REPORTING BUGS

Report bugs to zutils-bug@nongnu.org

Zutils home page: http://www.nongnu.org/zutils/zutils.html

COPYRIGHT

This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.