How to crack user password (John the Ripper) ?

John the Ripper (http://openwall.com)

Download john source (tar.gz)

# tar –xvzf john…..tar.gz

# cd john.1.6/src

# make (list in src directory)

# cd ../ run

# ./john –users:, /etc/shadow (this is the process to get password)
o/p will be cracked password

# ./john –show –users: /etc/shadow ( john.port having password of user which we cracked)