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    Command:

    grpck

    
    
    

    SYNOPSIS

           grpck [-r] [group [ shadow ]]
    
           grpck [-s] [group [ shadow ]]
    
    
    

    DESCRIPTION

           The grpck command verifies the integrity of the groups information. It
           checks that all entries in /etc/group and /etc/gshadow have the proper
           format and contain valid data. The user is prompted to delete entries
           that are improperly formatted or which have other uncorrectable errors.
    
           Checks are made to verify that each entry has:
    
           ?   the correct number of fields
    
           ?   a unique and valid group name
    
           ?   a valid group identifier (/etc/group only)
    
           ?   a valid list of members and administrators
    
           ?   a corresponding entry in the /etc/gshadow file (respectively
               /etc/group for the gshadow checks)
    
           The checks for correct number of fields and unique group name are
           fatal. If an entry has the wrong number of fields, the user will be
           prompted to delete the entire line. If the user does not answer
           affirmatively, all further checks are bypassed. An entry with a
           duplicated group name is prompted for deletion, but the remaining
           checks will still be made. All other errors are warnings and the user
           is encouraged to run the groupmod command to correct the error.
    
           The commands which operate on the /etc/group and /etc/gshadow files are
           not able to alter corrupted or duplicated entries.  grpck should be
           used in those circumstances to remove the offending entries.
    
    
    

    OPTIONS

           The options which apply to the grpck command are:
    
           -r
               Execute the grpck command in read-only mode. This causes all
               questions regarding changes to be answered no without user
               intervention.
    
           -s
               Sort entries in /etc/group and /etc/gshadow by GID.
    
           By default, grpck operates on /etc/groupand /etc/gshadow. The user may
           select alternate files with the group and shadow parameters.
    
    
    

    CONFIGURATION

           The following configuration variables in /etc/login.defs change the
               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.
    
    
    

    FILES

           /etc/group
               Group account information.
    
           /etc/gshadow
               Secure group account information.
    
           /etc/passwd
               User account information.
    
    
    

    EXIT VALUES

           The grpck command exits with the following values:
    
           0
               success
    
           1
               invalid command syntax
    
           2
               one or more bad group entries
    
           3
               can?t open group files
    
           4
               can?t lock group files
    
           5
               can?t update group files
    
    
    

    SEE ALSO

           group(5), groupmod(8), gshadow(5), passwd(5), pwck(8), shadow(5).
    
    
    

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

    
    
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