DOT-Files/Gentoo/gentooamd/home/user/.tldrc/tldr/pages/common/egrep.md

# egrep

> Find patterns in files using extended regular expression (supports `?`, `+`, `{}`, `()`, and `|`).
> More information: <https://manned.org/egrep>.

- Search for a pattern within a file:

`egrep "{{search_pattern}}" {{path/to/file}}`

- Search for a pattern within multiple files:

`egrep "{{search_pattern}}" {{path/to/file1 path/to/file2 ...}}`

- Search `stdin` for a pattern:

`cat {{path/to/file}} | egrep {{search_pattern}}`

- Print file name and line number for each match:

`egrep {{[-H|--with-filename]}} {{[-n|--line-number]}} "{{search_pattern}}" {{path/to/file}}`

- Search for a pattern in all files recursively in a directory, ignoring binary files:

`egrep {{[-r|--recursive]}} --binary-files={{without-match}} "{{search_pattern}}" {{path/to/directory}}`

- Search for lines that do not match a pattern:

`egrep {{[-v|--invert-match]}} "{{search_pattern}}" {{path/to/file}}`