tldr/pages/common/grep.md

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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}}`
- Print file names with matches:
`grep -rl {{something}} .`
- Use the standard input instead of a file:
`cat {{path/to/file}} | grep {{something}}`
- Invert match for excluding specific strings:
`grep -v {{something}}`