shadow(4)                        UNIX System V                        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






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