John The Ripper - jtr

John The Ripper, also known as 'jtr', and recently known as 'john' is a password cracker tool used by hacker in brute force attacks.Brute force attack is the hit and trial method of using random passwords to crack into a system. John the ripper is so powerful enough at generating random passwords of specified lengths using specified characters.

Installing john the ripper is easy in Linux system.If your package manager is 'yum' then its pretty straight forward to use the command:
 'sudo yum install john'
and for those with apt-get
'sudo apt-get install john' 
Or you can visit 'John the Ripper password cracker' s website at http://www.openwall.com/john/ for download. It is available for Linux, Mac and Windows.
Once the password cracker tool, john is installed you can check it's installation and usage help by the command 'john' in terminal, the output of the command should be as shown in the image below:

John The Ripper - Password Cracker Tool



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