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    Command:

    pwconv

    
    
    
    

    SYNOPSIS

           pwconv
    
           pwunconv
    
           grpconv
    
           grpunconv
    
    
    

    DESCRIPTION

           The pwconv command creates shadow from passwd and an optionally
           existing shadow.
    
           The pwunconv command creates passwd from passwd and shadow and then
           removes shadow.
    
           The grpconv command creates gshadow from group and an optionally
           existing gshadow.
    
           The grpunconv command creates group from group and gshadow and then
           removes gshadow.
    
           These four programs all operate on the normal and shadow password and
           group files: /etc/passwd, /etc/group, /etc/shadow, and /etc/gshadow.
    
           Each program acquires the necessary locks before conversion.  pwconv
           and grpconv are similar. First, entries in the shadowed file which
           don?t exist in the main file are removed. Then, shadowed entries which
           don?t have 'x? as the password in the main file are updated. Any
           missing shadowed entries are added. Finally, passwords in the main file
           are replaced with 'x?. These programs can be used for initial
           conversion as well to update the shadowed file if the main file is
           edited by hand.
    
           pwconv will use the values of PASS_MIN_DAYS, PASS_MAX_DAYS, and
           PASS_WARN_AGE from /etc/login.defs when adding new entries to
           /etc/shadow.
    
           Likewise pwunconv and grpunconv are similar. Passwords in the main file
           are updated from the shadowed file. Entries which exist in the main
           file but not in the shadowed file are left alone. Finally, the shadowed
           file is removed. Some password aging information is lost by pwunconv.
           It will convert what it can.
    
    
    

    BUGS

           Errors in the password or group files (such as invalid or duplicate
           entries) may cause these programs to loop forever or fail in other
           strange ways. Please run pwck and grpck to correct any such errors
           before converting to or from shadow passwords or groups.
    
               groups are not larger than 1024 characters.
    
               If you need to enforce such limit, you can use 25.
    
               Note: split groups may not be supported by all tools (even in the
               Shadow toolsuite). You should not use this variable unless you
               really need it.
    
           The following configuration variables in /etc/login.defs change the
           behavior of pwconv:
    
           PASS_MAX_DAYS (number)
               The maximum number of days a password may be used. If the password
               is older than this, a password change will be forced. If not
               specified, -1 will be assumed (which disables the restriction).
    
           PASS_MIN_DAYS (number)
               The minimum number of days allowed between password changes. Any
               password changes attempted sooner than this will be rejected. If
               not specified, -1 will be assumed (which disables the restriction).
    
           PASS_WARN_AGE (number)
               The number of days warning given before a password expires. A zero
               means warning is given only upon the day of expiration, a negative
               value means no warning is given. If not specified, no warning will
               be provided.
    
    
    

    FILES

           /etc/login.defs
               Shadow password suite configuration.
    
    
    

    SEE ALSO

           grpck(8), login.defs(5), pwck(8).
    
    
    

    System Management Commands 07/24/2009 PWCONV(8)

    
    
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