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If you are the user wishing to change your password then use the 'passwd' command, or if you are on an NIS based system use 'ypasswd'.

As root you can change anyone's password by adding thier login name to then end, eg to change tom's password use passwd tom.

It is not a good idea to login as root and so sudo has been created which allows configured access to root commands by other users; if this case and you are so privileged (as an administrator), you would use: sudo passwd tom

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