passwd is a *nix program used to change a user or group password.

A normal user can only change the password for their own account (anything else would be a security risk) but the super user may change the password for any account and the administrator of a group can change the password for that group.

It is very important that the super user can change other peoples passwords because they will forget any password they use.

passwd can also be used to change account information such as Full Name, login shell, and password expiry dates and intervals.

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