Linux - Passwords

To change your password in Linux, ​all you need to do is run ​the P-A-S-S-W-D, or password command. When you set a password, ​it’s securely scrambled then stored in ​a special privileged file called /etc/shadow.

 ​If you’re managing a computer and you want to ​force a standard user to change their password, ​like we did in Windows, you can use the -E ​or expire flag with password like this. ​    This will immediately expire a user’s password ​and then make them set a new password ​the next time they login.