passwd(1)                  DG/UX 4.30                   passwd(1)



     NAME
          passwd - change login password

     SYNOPSIS
          passwd [ -f filename ] [ uid ]

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

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

          The new password is checked to ensure that it meets
          construction requirements.  When the new password is entered
          a second time, the two copies of the new password are
          compared.  If the two copies do not match, then the cycle of
          prompting for the new password is repeated (at most) two
          more times.

          Passwords must meet the following requirements:

          1)   Each password must have at least six characters. Only
               the first eight characters are significant.

          2)   Each password must contain at least two alphabetic
               characters and at least one numeric or special
               character.  In this case, `alphabetic' means upper and
               lowercase letters.

          3)   Each password must differ from the login name and from
               any reverse or circular shift of that name.  For
               comparison purposes, an uppercase letter and its
               corresponding lowercase letter are equivalent.

          4)   New passwords must differ from the old by at least
               three characters.  For comparison purposes, an
               uppercase letter and its corresponding lowercase letter
               are equivalent.

          Anyone whose effective uid is zero is called a superuser;
          see id(1) and su(1).  Superusers may change any password, so
          passwd does not prompt superusers for the old password.
          Superusers do not have to comply with password construction
          requirements.  A superuser can create a null password by
          entering a carriage return in response to the prompt for a
          new password.

     OPTIONS
          -f   Treat file as the password file. By default,
               /etc/passwd is used.



     Licensed material--property of copyright holder(s)         Page 1

     passwd(1)                  DG/UX 4.30                   passwd(1)



     FILES
          /etc/passwd

     SEE ALSO
          login(1), passwd(4), crypt(3), yppasswd(1)
          Robert Morris and Ken Thompson, UNIX Password Security

     WARNING
          Passwd will not change your password if it is stored by the
          Yellow Pages Service.  Refer to yppasswd(1) for more
          information.












































     Licensed material--property of copyright holder(s)         Page 2