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GRPCK(8)                    System Manager's Manual                   GRPCK(8)

       grpck - verify integrity of group files

       grpck [-r] [group shadow]

       grpck  verifies the integrity of the system authentication information.
       All entries in the /etc/group and /etc/gshadow are checked to see  that
       the entry has the proper format and valid data in each field.  The user
       is prompted to delete entries that are improperly  formatted  or  which
       have other incorrectable errors.

       Checks are made to verify that each entry has

            - the correct number of fields
            - a unique group name
            - a valid list of members and administrators

       The  checks  for  correct  number  of  fields and unique group name are
       fatal.  If the entry has the wrong number of fields, the user  will  be
       prompted to delete the entire line.  If the user does not answer affir-
       matively, 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  encour-
       aged to run the groupmod command to correct the error.

       The commands which operate on the /etc/group file are not able to alter
       corrupted or duplicated entries.  grpck should be used in those circum-
       stances to remove the offending entry.

       By  default,  grpck  operates on the files /etc/group and /etc/gshadow.
       The user may select alternate files with the group and  shadow  parame-
       ters.  Additionally, the user may execute the command in read-only mode
       by specifying the -r flag.  This causes all questions regarding changes
       to  be  answered  no  without  user  intervention.  grpck can also sort
       entries in /etc/group and /etc/gshadow by GID. To run it in  sort  mode
       pass it -s flag. No checks are performed then, it just sorts.

       /etc/group - group account information
       /etc/gshadow - encrypted passwords and group administrator information
       /etc/passwd - user information

       group(5), passwd(5), shadow(5), groupmod(8)

       The grpck command exits with the following values:

       0    Success

       1    Syntax Error

       2    One or more bad group entries

       3    Cannot open group files

       4    Cannot lock group files

       5    Cannot update group files

       Julianne Frances Haugh (jockgrrlATix.com)