tldr/pages/common/grep.md

# grep

> Matches patterns in input text.
> Supports simple patterns and regular expressions.

- Search for a pattern within a file:

`grep {{search_pattern}} {{path/to/file}}`

- Search for an exact string:

`grep -F {{exact_string}} {{path/to/file}}`

- Search for a pattern [R]ecursively in the current directory, showing matching line [n]umbers, [I]gnoring non-text files:

`grep -RIn {{search_pattern}} .`

- Use extended regular expressions (supporting `?`, `+`, `{}`, `()` and `|`), in case-insensitive mode:

`grep -Ei {{search_pattern}} {{path/to/file}}`

- Print 3 lines of [C]ontext around, [B]efore, or [A]fter each match:

`grep -{{C|B|A}} 3 {{search_pattern}} {{path/to/file}}`

- Print file name with the corresponding line number for each match:

`grep -Hn {{search_pattern}} {{path/to/file}}`

- Use the standard input instead of a file:

`cat {{path/to/file}} | grep {{search_pattern}}`

- In[v]ert match for excluding specific strings:

`grep -v {{search_pattern}}`
initial commit 2013-12-08 19:56:16 +11:00			`# grep`

Formatted all pages according to guidelines. 2016-01-07 18:31:27 +01:00			`> Matches patterns in input text.`
			`> Supports simple patterns and regular expressions.`
initial commit 2013-12-08 19:56:16 +11:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`- Search for a pattern within a file:`
Fix lint for common 2015-10-22 15:31:52 +08:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`grep {{search_pattern}} {{path/to/file}}`
initial commit 2013-12-08 19:56:16 +11:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`- Search for an exact string:`
grep: add -i option 2016-01-28 00:12:10 +02:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`grep -F {{exact_string}} {{path/to/file}}`
grep: add -i option 2016-01-28 00:12:10 +02:00
grep: add line numbers on search (#4599) 2020-10-11 02:46:14 +07:00			`- Search for a pattern [R]ecursively in the current directory, showing matching line [n]umbers, [I]gnoring non-text files:`
Add an explanation of recursive search. 2014-01-28 13:41:32 +01:00
grep: add line numbers on search (#4599) 2020-10-11 02:46:14 +07:00			`grep -RIn {{search_pattern}} .`
Add an explanation of recursive search. 2014-01-28 13:41:32 +01:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			- Use extended regular expressions (supporting `?`, `+`, `{}`, `()` and `\|`), in case-insensitive mode:
initial commit 2013-12-08 19:56:16 +11:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`grep -Ei {{search_pattern}} {{path/to/file}}`
initial commit 2013-12-08 19:56:16 +11:00
grep: add flags for lines before and after the match (#1020) 2016-08-29 05:13:14 +05:30			`- Print 3 lines of [C]ontext around, [B]efore, or [A]fter each match:`
initial commit 2013-12-08 19:56:16 +11:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`grep -{{C\|B\|A}} 3 {{search_pattern}} {{path/to/file}}`
initial commit 2013-12-08 19:56:16 +11:00
grep: remove 2 examples (#1750) * grep: remove 2 examples Make the page conform to our maximum limit of 8 examples Fixes #1695 * Address review comments 2017-12-07 08:53:40 +05:30			`- Print file name with the corresponding line number for each match:`
initial commit 2013-12-08 19:56:16 +11:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`grep -Hn {{search_pattern}} {{path/to/file}}`
grep.md: add -l example (#913) 2016-06-21 15:11:27 +08:00
Formatted all pages according to guidelines. 2016-01-07 18:31:27 +01:00			`- Use the standard input instead of a file:`
initial commit 2013-12-08 19:56:16 +11:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`cat {{path/to/file}} \| grep {{search_pattern}}`
Added invert match parameter. 2014-07-27 10:23:56 +02:00
grep: -v for in[v]ert (#5216) 2021-02-02 16:44:00 +04:00			`- In[v]ert match for excluding specific strings:`
Added invert match parameter. 2014-07-27 10:23:56 +02:00
grep: clarify that regexp is used by default grep searches for regexp by default on Linux, and the '-F' switch is required for the exact string. Corrected by replacing search_string with search_pattern, or adding the mentioned switch. 2020-06-09 10:34:03 +02:00			`grep -v {{search_pattern}}`