LAB1: GREP

Purpose: Show how to use grep.

Procedure:

Create grepfile.grep with the following content:

[cati@centos6 ~]$ cat grepfile.grep

alfabet

bbb

vad pe masa mere bbbune

10.23.14.66

www.example.eu

bbb

bbb

bbb

Search for a string:

[cati@centos6 ~]$ grep "bbb" grepfile.grep

bbb

vad pe masa mere bbbune

bbb

bbb

bbb

Search for a string. Line numbers displayed.

[cati@centos6 ~]$ grep -n "bbb" grepfile.grep

2:bbb

3:vad pe masa mere bbbune

7:bbb

9:bbb

10:bbb

Search for lines without string. Line numbers displayed also.

[cati@centos6 ~]$ grep -vn "bbb" grepfile.grep

1:alfabet

4:10.23.14.66

5:www.example.eu

6:

8:

11:

Grep an ip address:

[cati@centos6 ~]$ grep '^[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-

9]\{1,3\}$' grepfile.grep

10.23.14.66

Grep exact word:

[cati@centos6 ~]$ grep -w "bbb" grepfile.grep

bbb

bbb

bbb

bbb

Try also the –i option.