.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.49.2.
.TH ZTEST "1" "January 2024" "zutils 1.13" "User Commands"
.SH NAME
ztest \- check the integrity of compressed files
.SH SYNOPSIS
.B ztest
[\fI\,options\/\fR] [\fI\,files\/\fR]
.SH DESCRIPTION
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.
.PP
If no files are specified, recursive searches examine the current
working directory, and nonrecursive searches read standard input.
.PP
The formats supported are bzip2, gzip, lzip, xz, and zstd.
.PP
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.
.PP
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.
.SH OPTIONS
.TP
\fB\-h\fR, \fB\-\-help\fR
display this help and exit
.TP
\fB\-V\fR, \fB\-\-version\fR
output version information and exit
.TP
\fB\-M\fR, \fB\-\-format=\fR<list>
process only the formats in <list>
.TP
\fB\-N\fR, \fB\-\-no\-rcfile\fR
don't read runtime configuration file
.TP
\fB\-O\fR, \fB\-\-force\-format=\fR<fmt>
force the input format
.TP
\fB\-q\fR, \fB\-\-quiet\fR
suppress all messages
.TP
\fB\-r\fR, \fB\-\-recursive\fR
operate recursively on directories
.TP
\fB\-R\fR, \fB\-\-dereference\-recursive\fR
recursively follow symbolic links
.TP
\fB\-v\fR, \fB\-\-verbose\fR
be verbose (a 2nd \fB\-v\fR gives more)
.TP
\fB\-\-bz2=\fR<command>
set compressor and options for bzip2 format
.TP
\fB\-\-gz=\fR<command>
set compressor and options for gzip format
.TP
\fB\-\-lz=\fR<command>
set compressor and options for lzip format
.TP
\fB\-\-xz=\fR<command>
set compressor and options for xz format
.TP
\fB\-\-zst=\fR<command>
set compressor and options for zstd format
.PP
Valid formats for options '\-M' and '\-O' are 'bz2', 'gz', 'lz', 'xz', and 'zst'.
.SH "REPORTING BUGS"
Report bugs to zutils\-bug@nongnu.org
.br
Zutils home page: http://www.nongnu.org/zutils/zutils.html
.SH COPYRIGHT
Copyright \(co 2024 Antonio Diaz Diaz.
License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
.br
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
.SH "SEE ALSO"
The full documentation for
.B ztest
is maintained as a Texinfo manual.  If the
.B info
and
.B ztest
programs are properly installed at your site, the command
.IP
.B info zutils
.PP
should give you access to the complete manual.