You provide the grep command a pattern and a file you want it to search. The basic grep syntax is always the same.
GREP REGEXP INSTALL
This differs slightly from the GNU version, so if you want to follow along exactly with this article, then install GNU grep from a project like Homebrew or MacPorts. On macOS, you have the BSD version of grep.
![grep regexp grep regexp](https://www.cyberciti.biz/media/new/faq/2010/02/Regular-Expressions-in-grep.png)
If you're using Linux, you already have grep installed.
![grep regexp grep regexp](https://www.tecmint.com/wp-content/uploads/2016/02/grep-command.png)
This article introduces you to some of its features I find most useful. Learning the grep command is easy, although it does take some practice.
![grep regexp grep regexp](https://benisnous.com/wp-content/uploads/2020/11/Regular-Expression-Grep-Egrep-Fgrep-In-RHEL-8-In-Hindi.jpg)
One of the classic Unix commands, developed way back in 1974 by Ken Thompson, is the Global Regular Expression Print (grep) command.