password command

password command is used to change the password. Using this command a user can change their own password and also other’s user password.A root user has the sole privilege to change another person’s password even if that particular password is not known.A normal user can run passwd to change their own password, and a system administrator (the superuser) can use passwd to change another user's password, or define how that account's password can be used or changed. Syntax: Passwd [option] [user].