grep command is one of the most frequently used UNIX command stands for "Global Regular Expression Print" like find, chmod or tar command in Unix. grep command in Unix operating system e.g. Linux, Solaris, BSD, Ubuntu or IBM AIX is used to search files for matching patterns, by using grep command in Unix you can search a file which contains a particular word or particular pattern. UNIX grep command also provides several useful command line option which can be used to enhance the functionality of grep command e.g. by using grep -v you can list down all files which don't contain a word i.e. excluding files which matches a pattern, grep -c will print count of matching pattern in a file etc. One of the popular examples of grep command is to find empty files and directories in Unix.
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