Penetration Testing with the Bash shell

Getting to know grep

The Global Regular Expression Print (grep) utility is a staple for all command-line jockeys. The grep utility in its most basic functionality gives its users the ability to run regular expressions on a given input file or stream and prints the matching results. More advanced features of grep allow you to specify which attributes of the matching text you'd like to print, whether you'd like the output colorized, or even how many lines around the matching output you should print. It's packed with many very useful features, and once mastered they become an essential part of any penetration tester, developer, or system administrator's arsenal.

Tip

To properly make use of grep, you will need at least basic understanding and practice ...