grpck(1) [redhat man page]

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)

Check Out this Related Man Page

pwck(1M)						  System Administration Commands						  pwck(1M)

NAME

       pwck, grpck - password/group file checkers

SYNOPSIS

       /usr/sbin/pwck [filename]

       /usr/sbin/grpck [filename]

DESCRIPTION

       pwck  scans  the  password  file and notes any inconsistencies. The checks include validation of the number of fields, login name, user ID,
       group ID, and whether the login directory and the program-to-use-as-shell exist.  The default password file is /etc/passwd.

       grpck  verifies all entries in the group file. This verification includes a check of the number of fields, group name,  group  ID,  whether
       any  login  names belong to more than NGROUPS_MAX groups, and that all login names appear in the password file. grpck also issues a warning
       if it finds an entry (a single line) in the group file longer than  2047 characters.  Such an entry causes group maintenance commands, such
       as groupdel(1M) and groupmod(1M), to fail.

       The default group file is /etc/group.

       All messages regarding inconsistent entries are placed on the stderr stream.

FILES

	   o	  /etc/group

	   o	  /etc/passwd

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       groupdel(1M), groupmod(1M), getpwent(3C), group(4), passwd(4), attributes(5)

DIAGNOSTICS

       Group entries in /etc/group with no login names are flagged.

       Group file 'filename' is empty

	   The /etc/passwd or /etc/group file is an empty file.

       cannot open file filename: No such file or directory

	   The /etc/passwd or /etc/group file does not exist.

NOTES

       If  no filename argument is given,  grpck checks the local group file,  /etc/group, and also makes sure that all login names encountered in
       the checked group file are known to the system  getpwent(3C) routine.  This means that the login names may be supplied by  a  network  name
       service.

SunOS 5.11							    27 Aug 2008 							  pwck(1M)

Linux and UNIX Man Pages

grpck(1) [redhat man page]

Check Out this Related Man Page