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tldr/pages/common/grep.md
Waldir Pimenta 7782d92820 various tweaks to grep 
- use "case-insensitive" in the description of the -i option to make the initialism clear
- use path/to/file instead of file_path
- mention extended regex syntax and expand first occurrence to spell "regular expression"
- clarify wording of the -C example description
2016-04-22 12:24:24 +01:00

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grep

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

  • Search for an exact string:

grep {{something}} {{file_path}}

  • Search in case-insensitive mode:

grep -i {{something}} {{path/to/file}}

  • Search recursively in current directory for an exact string:

grep -r {{something}} .

  • Use a regular expression (-E for extended regex, supporting ?, +, {, |, (, and )):

grep -e {{^regex$}} {{path/to/file}}

  • Print 3 lines of context around each match:

grep -C 3 {{something}} {{path/to/file}}

  • Print the count of matches instead of the matching text:

grep -c {{something}} {{path/to/file}}

  • Print line number for each match:

grep -n {{something}} {{path/to/file}}

  • Use the standard input instead of a file:

cat {{path/to/file}} | grep {{something}}

  • Invert match for excluding specific strings:

grep -v {{something}}