zgrep - search compressed files for a regular expression
zgrep [options] <pattern>
[files]
zgrep is a front end to the program grep that allows transparent
search on any combination of compressed and uncompressed files. If any file
given is compressed, its decompressed content is used. If a file given does
not exist, and its name does not end with one of the known extensions, zgrep
tries the compressed file names corresponding to the formats supported. If a
file fails to decompress, zgrep continues searching the rest of the
files.
If a file is specified as '-', data are read from standard input,
decompressed if needed, and fed to grep. Data read from standard input must
be of the same type; all uncompressed or all in the same compressed
format.
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, and xz.
Exit status is 0 if match, 1 if no match, 2 if trouble. Some
options only work if the grep program used supports them.
- --help
- display this help and exit
- -V, --version
- output version information and exit
- -a, --text
- treat all files as text
- -A,
--after-context=<n>
- print <n> lines of trailing context
- -b,
--byte-offset
- print the byte offset of each line
- -B,
--before-context=<n>
- print <n> lines of leading context
- -c, --count
- only print a count of matching lines per file
- -C,
--context=<n>
- print <n> lines of output context
- --color[=<when>]
- show matched strings in color
- -e,
--regexp=<pattern>
- use <pattern> as the pattern to match
- -E,
--extended-regexp
- <pattern> is an extended regular expression
- -f,
--file=<file>
- obtain patterns from <file>
- -F,
--fixed-strings
- <pattern> is a set of newline-separated strings
- -h,
--no-filename
- suppress the prefixing filename on output
- -H,
--with-filename
- print the filename for each match
- -i,
--ignore-case
- ignore case distinctions
- -I
- ignore binary files
- -l,
--files-with-matches
- only print names of files containing matches
- -L,
--files-without-match
- only print names of files containing no matches
- -m,
--max-count=<n>
- stop after <n> matches
- -M,
--format=<list>
- process only the formats in <list>
- -n,
--line-number
- print the line number of each line
- -N,
--no-rcfile
- don't read runtime configuration file
- -o,
--only-matching
- show only the part of a line matching <pattern>
- -O,
--force-format=<fmt>
- force the format given (bz2, gz, lz, xz)
- -q, --quiet
- suppress all messages
- -r,
--recursive
- operate recursively on directories
- -R,
--dereference-recursive
- recursively follow symbolic links
- -s,
--no-messages
- suppress error messages
- -v,
--invert-match
- select non-matching lines
- --verbose
- verbose mode (show error messages)
- -w,
--word-regexp
- match only whole words
- -x,
--line-regexp
- match only whole lines
- --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
Numbers 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...
Report bugs to zutils-bug@nongnu.org
Zutils home page: http://www.nongnu.org/zutils/zutils.html
Copyright © 2021 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.