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tldr/pages/common/grep.md
Szczepan Zalega 8d8f4c61c6 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.
2020-08-16 16:41:58 +01:00

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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 recursively in the current directory, ignoring non-text files:

grep -RI {{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}}

  • Invert match for excluding specific strings:

grep -v {{search_pattern}}