NAME
zcmp - decompress and compare two files byte by byte
SYNOPSIS
zcmp [options] file1 [file2]
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.
The formats supported are bzip2, gzip, lzip, xz, and zstd.
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 to compare file1 with the corresponding uncompressed file (if file1 is compressed), and then with the corresponding compressed files of the remaining formats until one is found.
Exit status is 0 if inputs are identical, 1 if different, 2 if trouble.
OPTIONS
-h, --help
display this help and exit
-V, --version
output version information and exit
-b, --print-bytes
print differing bytes
-H, --hexadecimal
print hexadecimal values instead of octal
-i, --ignore-initial=<n>[:<n2>]
ignore differences in the first <n> bytes
-l, --list
list position, value of all differing bytes
-M, --format=<list>
process only the formats in <list>
-n, --bytes=<n>
compare at most <n> bytes
-N, --no-rcfile
don’t read runtime configuration file
-O, --force-format=[<f1>][,<f2>]
force one or both input formats
-q, --quiet, --silent
suppress diagnostics written to stderr
-s, --script
suppress messages about file differences
-v, --verbose
verbose mode (opposite of --quiet)
--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’, ’zst’, and ’un’ for uncompressed.
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.
REPORTING BUGS
Report bugs to
zutils-bug [AT] nongnu.org
Zutils home page:
http://www.nongnu.org/zutils/zutils.html
COPYRIGHT
Copyright
© 2024 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 zcmp is maintained as a Texinfo manual. If the info and zcmp programs are properly installed at your site, the command
info zutils
should give you access to the complete manual.