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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.47.16.
.TH ZCMP "1" "January 2023" "zutils 1.12" "User Commands"
.SH NAME
zcmp \- decompress and compare two files byte by byte
.SH SYNOPSIS
.B zcmp
[\fI\,options\/\fR] \fI\,file1 \/\fR[\fI\,file2\/\fR]
.SH DESCRIPTION
zcmp compares two files and, if they differ, writes to standard output the
first byte and line number where they differ. Bytes and lines are numbered
starting with 1. A hyphen '\-' used as a file argument means standard input.
If any file given is compressed, its decompressed content is used. Compressed
files are decompressed on the fly; no temporary files are created.
.PP
The formats supported are bzip2, gzip, lzip, xz, and zstd.
.PP
zcmp compares file1 to file2. The standard input is used only if file1 or
file2 refers to standard input. If file2 is omitted zcmp tries the
following:
.IP
\- If file1 is compressed, compares its decompressed contents with
the corresponding uncompressed file (the name of file1 with the
extension removed).
.IP
\- If file1 is uncompressed, compares it with the decompressed
contents of file1.[lz|bz2|gz|zst|xz] (the first one that is found).
.PP
Exit status is 0 if inputs are identical, 1 if different, 2 if trouble.
.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\-b\fR, \fB\-\-print\-bytes\fR
print differing bytes
.TP
\fB\-H\fR, \fB\-\-hexadecimal\fR
print hexadecimal values instead of octal
.TP
\fB\-i\fR, \fB\-\-ignore\-initial=\fR<n>[:<n2>]
ignore differences in the first <n> bytes
.TP
\fB\-l\fR, \fB\-\-list\fR
list position, value of all differing bytes
.TP
\fB\-M\fR, \fB\-\-format=\fR<list>
process only the formats in <list>
.TP
\fB\-n\fR, \fB\-\-bytes=\fR<n>
compare at most <n> bytes
.TP
\fB\-N\fR, \fB\-\-no\-rcfile\fR
don't read runtime configuration file
.TP
\fB\-O\fR, \fB\-\-force\-format\fR=\fI\,[\/\fR<f1>][,<f2>]
force one or both input formats
.TP
\fB\-q\fR, \fB\-\-quiet\fR, \fB\-\-silent\fR
suppress diagnostics written to stderr
.TP
\fB\-s\fR, \fB\-\-script\fR
suppress messages about file differences
.TP
\fB\-v\fR, \fB\-\-verbose\fR
verbose mode (opposite of \fB\-\-quiet\fR)
.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', 'zst',
and 'un' for uncompressed.
.PP
Byte counts given as arguments to options may be expressed in decimal,
hexadecimal, or octal (using the same syntax as integer constants in C++),
and may be followed by a multiplier: k = kB = 10^3 = 1000,
Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc.
.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 2023 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 zcmp
is maintained as a Texinfo manual. If the
.B info
and
.B zcmp
programs are properly installed at your site, the command
.IP
.B info zutils
.PP
should give you access to the complete manual.
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