Beauty Of Grep

Usage:grep keyword filename

1) How to ignore some words while doing search using grep in UNIX:

Example:
grep Exception logfile.txt | grep -v Error

2) How to count occurrence of a word in a file using grep command:

grep -c Exception logfile.txt



3) Printing lines after  or before matching a word :

grep -C 6 Exception logfile.txt



4) How to search pattern using egrep and regular expression:

We can use '|' to search for either Error or Exception in single comand

egrep 'Error|Exception' filename.txt



5) -i can be used for case insensitive search

6) zgrep can be used to search patterns in gz files.

7) How to search a whole word in file using grep

grep -w word filename