passwd(1)                        DG/UX 5.4.2                       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.

FILES
       /etc/passwd

SEE ALSO
       login(1), yppasswd(1) crypt(3C), passwd(4),



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

passwd(1)                        DG/UX 5.4.2                       passwd(1)


       Robert Morris and Ken Thompson, UNIX Password Security

NOTES
       Passwd will not change your password if it is stored by the Network
       Information Service (NIS).  Refer to yppasswd(1) for more
       information.



















































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