tldr/pages/common/grep.md

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}}