RedHat 9 (Linux i386) - man page for shadow (redhat section 5)

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SHADOW(5)										SHADOW(5)

       shadow - encrypted password file

       shadow  contains  the  encrypted password information for user's accounts and optional the
       password aging information.  Included is

	    Login name

	    Encrypted password

	    Days since Jan 1, 1970 that password was last changed

	    Days before password may be changed

	    Days after which password must be changed

	    Days before password is to expire that user is warned

	    Days after password expires that account is disabled

	    Days since Jan 1, 1970 that account is disabled

	    A reserved field

       The password field must be filled.  The encryped password consists of 13 to 24  characters
       from  the  64 character alphabet a thru z, A thru Z, 0 thru 9, . and /.	Refer to crypt(3)
       for details on how this string is interpreted.

       The date of the last password change is given as the number of days  since  Jan	1,  1970.
       The  password  may  not	be changed again until the proper number of days have passed, and
       must be changed after the maximum number of days.  If the minimum number of days  required
       is greater than the maximum number of day allowed, this password may not be changed by the

       An account is considered to be inactive and is disabled if the  password  is  not  changed
       within  the  specified number of days after the password expires.  An account will also be
       disabled on the specified day regardless of other password expiration information.

       This  information  supercedes  any  password  or  password  age	information  present   in

       This file must not be readable by regular users if password security is to be maintained.

       /etc/passwd - user account information
       /etc/shadow - encrypted user passwords

       chage(1), login(1), passwd(1), su(1), passwd(5), pwconv(8), pwunconv(8), sulogin(8)

       Julianne Frances Haugh (

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