redhat man page for grpck

GRPCK(1)						      General Commands Manual							  GRPCK(1)

NAME
       grpck - verify integrity of group files

SYNOPSIS
       grpck [-r] [group shadow]

DESCRIPTION
       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 affirmatively, all further checks are bypassed.  An entry  with  a  dupli-
       cated  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 file are not able to alter corrupted or duplicated entries.  grpck should  be  used  in  those
       circumstances to remove the offending entry.

OPTIONS
       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.

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

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

DIAGNOSTICS
       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

AUTHOR
       Julianne Frances Haugh (jockgrrl@ix.netcom.com)

																	  GRPCK(1)