To change a password in Linux, all you need to do is run the passwd or password command. Let's try changing my password. When you set a password, it's securely scrambled then stored in a special privileged file called slash etsy slash shadow.
This file can only be read by root to keep away prying eyes. even if you did have access you wouldn't be able to de-scramble passwords found in here 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 dash 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 log in