What is fgrep command used for?
The fgrep filter is used to search for the fixed-character strings in a file. How to use fgrep? Q3. "Fixed-character" means the string is interpreted literally — metacharacters do not exist, and therefore regular expressions cannot be used. The fgrep command searches the input files specified by the File Parameter ( standard input by. Both of these commands are used to search any string or regular expression in file, directory or even in multiple folders.