How to Use Grep Command in Linux?

The ‘grep’ command is used to search a given file for patterns specified by the user.

Basically ‘grep’ lets you enter a pattern of text and then it searches for this pattern within the text that you provide it.

It returns all the lines that have the given pattern or string in them.

How do I use the grep command?

The grep command is used to search text or searches the given file for lines containing a match to the given strings or words. By default, grep displays the matching lines. Use grep to search for lines of text that match one or many regular expressions, and outputs only the matching lines.

How does grep command work in Unix?

Grep command in Unix/Linux is a powerful tool that searches for matching a regular expression against text in a file, multiple files or a stream of input. It searches for the pattern of text that you specify on the command line and prints output for you.