egrep is an acronym for "Extended Global Regular Expressions Print". It is a program which scans a specified file line by line, returning lines that contain a pattern matching a given regular expression.

What is the difference between egrep and fgrep?

The grep filter searches a file for a particular pattern of characters and displays all lines that contain that pattern. The fgrep filter searches for fixed-character strings in a file or files. The main difference between both commands is: String matching algorithm used by them.

Is egrep same as grep?

The main difference between grep and egrep is that grep is a command that allows searching content according to the given regular expression and displaying the matching lines while egrep is a variant of grep that helps to search content by applying extended regular expressions to display the machining lines.