GREP

GREP is a command line search utility or tool  to filter the input given to it. Grep got its name from ed editor as g/re/p (global / regular expression / print).

In this post we will see how to use grep in detail and next post with the help of regular expressions.

GREP command syntax

grep options searchterm filename

or

command | grep options searchterm 

For searching a word in file

 grep 'ada' filename

For search a word which is either caps or small letters(i — case insensitive )

 grep -i 'ac' filename

inverse search for a word

 grep -v 'ac' filename

To count a word occurrence

 find -c ‘ac’ filename

Find ac characters along line numbers

 grep -n 'ac' filename

Find exact word ac

 grep -x 'ac' filename