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36 lines
1.4 KiB
Markdown
36 lines
1.4 KiB
Markdown
# grep
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> Find patterns in files using regular expressions.
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> More information: <https://www.gnu.org/software/grep/manual/grep.html>.
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- Search for a pattern within a file:
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`grep "{{search_pattern}}" {{path/to/file}}`
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- Search for an exact string (disables regular expressions):
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`grep {{[-F|--fixed-strings]}} "{{exact_string}}" {{path/to/file}}`
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- Search for a pattern in all files recursively in a directory, showing line numbers of matches, ignoring binary files:
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`grep {{[-rnI|--recursive --line-number --binary-files=without-match]}} "{{search_pattern}}" {{path/to/directory}}`
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- Use extended regular expressions (supports `?`, `+`, `{}`, `()`, and `|`), in case-insensitive mode:
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`grep {{[-Ei|--extended-regexp --ignore-case]}} "{{search_pattern}}" {{path/to/file}}`
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- Print 3 lines of [C]ontext around, [B]efore or [A]fter each match:
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`grep --{{context|before-context|after-context}} 3 "{{search_pattern}}" {{path/to/file}}`
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- Print file name and line number for each match with color output:
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`grep {{[-Hn|--with-filename --line-number]}} --color=always "{{search_pattern}}" {{path/to/file}}`
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- Search for lines matching a pattern, printing only the matched text:
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`grep {{[-o|--only-matching]}} "{{search_pattern}}" {{path/to/file}}`
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- Search `stdin` for lines that do not match a pattern:
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`cat {{path/to/file}} | grep {{[-v|--invert-match]}} "{{search_pattern}}"`
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