shadow(4)                                                         shadow(4)


   NAME
         shadow - shadow password file

   DESCRIPTION
         /etc/shadow is an access-restricted ASCII system file.  The fields
         for each user entry are separated by colons.  Each user is separated
         from the next by a new-line.  Unlike the /etc/passwd file,
         /etc/shadow does not have general read permission.

         Here are the fields in /etc/shadow:

            username    The user's login name (ID).

            password    A 13-character encrypted password for the user, a lock
                        string to indicate that the login is not accessible,
                        or no string to show that there is no password for the
                        login.

            lastchanged The number of days between January 1, 1970, and the
                        date that the password was last modified.

            minimum     The minimum number of days required between password
                        changes.

            maximum     The maximum number of days the password is valid.

            warn        The number of days before password expires that the
                        user is warned.

            inactive    The number of days of inactivity allowed for that
                        user.

            expire      An absolute date specifying when the login may no
                        longer be used.

            flag        Reserved for future use, set to zero.  Currently not
                        used.

         The encrypted password consists of 13 characters chosen from a 64-
         character alphabet (., /, 0-9, A-Z, a-z).

         To update this file, use the passwd, useradd, usermod, or userdel
         commands.

   FILES
         /etc/shadow

   SEE ALSO
         useradd(1M), usermod(1M), userdel(1M), passwd(4)
         putspent(3X), getspent(3X) in the Programmer's Reference Manual
         login(1), passwd(1) in the User's Reference Manual


   8/91                                                                 Page 1

   shadow(4)                                                         shadow(4)























































   Page 2                                                                 8/91