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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.
36 lines
945 B
Markdown
36 lines
945 B
Markdown
# grep
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> Matches patterns in input text.
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> Supports simple patterns and regular expressions.
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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:
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`grep -F {{exact_string}} {{path/to/file}}`
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- Search for a pattern recursively in the current directory, ignoring non-text files:
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`grep -RI {{search_pattern}} .`
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- Use extended regular expressions (supporting `?`, `+`, `{}`, `()` and `|`), in case-insensitive mode:
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`grep -Ei {{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 -{{C|B|A}} 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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`grep -Hn {{search_pattern}} {{path/to/file}}`
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- Use the standard input instead of a file:
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`cat {{path/to/file}} | grep {{search_pattern}}`
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- Invert match for excluding specific strings:
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`grep -v {{search_pattern}}`
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