Grep and egrep

Grep nobody/etc/passwd display rows with nobody characters in/etc/passwd, case sensitive

Grep-I nobody/etc/passwd real-world/etc/passwd rows with nobody characters, case insensitive

Grep-V nobody/etc/passwd rows that do not contain the nobody

Grep-N nobody/etc/passwd: displays the row containing the nobody and the row number.

Egrep is the extended grep

Egrep '2 | 5' test: List rows containing 2 or 5

Egrep '33 (2 | 5) 'test lists 33 rows followed by 2 or 5

 

Grep and egrep