grep command in Linux

In Linux grep stands for “global regular expression print”. The grep command used in searching and matching text files contained in the regular expressions.

The syntax is:

# grep pattern filename

SNo	Example	Explanation
1	# grep apple filename	The word apple will get extract from the filename
2	# grep -i apple filename	‘-i’  is a ignore case sensitive
3	# ls -l | grep filename	List the files and in the listed files extract the filename
4	# ls -l | grep d	Lists all the directories including files starting with d
5	# ls -l | grep ^d	In this we will get only directories starting character of ‘d’
6	# ls -l | grep ^-	In this we will get only files