PASSWD(1)                                               PASSWD(1)

     NAME
          passwd - change login password

     SYNOPSIS
          passwd [ name ]

     DESCRIPTION
          This command changes (or installs) a password associated
          with the user name (your own name by default).

          The program prompts for the old password and then for the
          new one.  The caller must supply both.  The new password
          must be typed twice, to forestall mistakes.

          New passwords must be at least four characters long if they
          use a sufficiently rich alphabet and at least six characters
          long if monocase.  These rules are relaxed if you are insis-
          tent enough.

          Only the owner of the name or the super-user may change a
          password; the owner must prove he knows the old password.

     FILES
          /etc/passwd

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