shadow(4)                 FILE FORMATS                  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 modi-
                    fied.

        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)



                                                                1

shadow(4)                 FILE FORMATS                  shadow(4)



     putspent(3C), getspent(3C)  in  the  Programmer's  Reference
     Manual
     login(1), passwd(1) in the User's Reference Manual




















































                                                                2