grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. Its name comes from the ed command g/re/p, which has the same effect: doing a global search with the regular expression and printing all matching lines.

Learn Unix Command :
1)cat command :
2)ls command :
3)mkdir and cd command :
4)cp command :
5)cut , paste and tr command :
6)sort command:
7)uniq command :
8)sed command :
9)Top 5 unix interview questions:


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