There are two ways to change passwords for Linux accounts. If you can log in as the account, you can change its password. If you are logged on as root, you can manage other user accounts to change passwords.
passwd(current) UNIX password: (enter original password)
New UNIX password: (enter the new password)
Retype new UNIX password: (enter the new password again)
passwd: All authenticaton tokens updated successfully.
passwd user_name
New UNIX password: (enter the new password)
Retype new UNIX password: (enter the new password again)
passwd: All authenticaton tokens updated successfully.