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SuSE 11.3 - man page for shadow (suse section 5)

SHADOW(5)			       File Formats Manual				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 characters alphabet a thru z, A thru Z, 0 thru 9, . and /. Optionally it can
       start with a "$" character. This means the encrypted password was generated using  another
       (not  DES) algorithm. For example if it starts with "$1$" it means the MD5-based algorithm
       was used.

       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 (jockgrrl@ix.netcom.com)


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