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grep: refresh (#5218)
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# grep
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> Matches patterns in input text.
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> Supports simple patterns and regular expressions.
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> Find patterns in files using regular expressions.
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> More information: <https://man7.org/linux/man-pages/man1/grep.1.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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`grep "{{search_pattern}}" {{path/to/file}}`
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- Search for an exact string:
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- Search for an exact string (disables regular expressions):
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`grep -F {{exact_string}} {{path/to/file}}`
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`grep --fixed-strings "{{exact_string}}" {{path/to/file}}`
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- Search for a pattern [R]ecursively in the current directory, showing matching line [n]umbers, [I]gnoring non-text files:
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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 -RIn {{search_pattern}} .`
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`grep --recursive --line-number --binary-files={{without-match}} "{{search_pattern}}" {{path/to/directory}}`
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- Use extended regular expressions (supporting `?`, `+`, `{}`, `()` and `|`), in case-insensitive mode:
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- Use extended regular expressions (supports `?`, `+`, `{}`, `()` and `|`), in case-insensitive mode:
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`grep -Ei {{search_pattern}} {{path/to/file}}`
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`grep --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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- Print 3 lines of context around, before, or after each match:
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`grep -{{C|B|A}} 3 {{search_pattern}} {{path/to/file}}`
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`grep --{{context|before-context|after-context}}={{3}} "{{search_pattern}}" {{path/to/file}}`
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- Print file name with the corresponding line number for each match:
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- Print file name and line number for each match:
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`grep -Hn {{search_pattern}} {{path/to/file}}`
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`grep --with-filename --line-number "{{search_pattern}}" {{path/to/file}}`
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- Use the standard input instead of a file:
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- Search for lines matching a pattern, printing only the matched text:
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`cat {{path/to/file}} | grep {{search_pattern}}`
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`grep --only-matching "{{search_pattern}}" {{path/to/file}}`
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- In[v]ert match for excluding specific strings:
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- Search stdin for lines that do not match a pattern:
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`grep -v {{search_pattern}}`
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`cat {{path/to/file}} | grep --invert-match "{{search_pattern}}"`
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