1PASSWD(1)                   General Commands Manual                  PASSWD(1)
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NAME

6       passwd - change login password
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SYNOPSIS

9       passwd [ name ]
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DESCRIPTION

12       This  command changes (or installs) a password associated with the user
13       name (your own name by default).
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15       The program prompts for the old password and then for the new one.  The
16       caller  must  supply  both.   The  new password must be typed twice, to
17       forestall mistakes.
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19       New passwords must be at least four characters long if they use a  suf‐
20       ficiently  rich  alphabet and at least six characters long if monocase.
21       These rules are relaxed if you are insistent enough.
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23       Only the owner of the name or the super-user may change a password; the
24       owner must prove he knows the old password.
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FILES

27       /etc/passwd
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SEE ALSO

30       login(1), passwd(5), crypt(3)
31       Robert Morris and Ken Thompson, Password Security: A Case History
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