grpck(1M)

NAME
     grpck - group file checker

SYNOPSIS
     grpck [ file ]

DESCRIPTION
     grpck verifies all entries in the group file, file.  This verification
     includes a check of: the number of fields, group name, group ID, whether
     all login names appear in the password file, duplicate logname entries,
     and maximum number of groups per logname.  The default group file is
     /etc/group.

     grpck has the ability to parse YP entries in the group file.

FILES
     /etc/group

SEE ALSO
     group(4), passwd(4).

DIAGNOSTICS
     Too many/few fields
          An entry in the group file does not have the proper number of
          fields.

     No group name
          The group name field of an entry is empty.

     Bad character(s) in group name
          The group name in an entry contains characters that are unprintable
          (see isprint(3C)).

     Invalid GID
          The group ID field in an entry is not numeric or is less than 0 or
          greater than 65535.

     Null login name
          A login name in the list of login names in an entry is null.

     Login name not found in password file
          A login name in the list of login names in an entry is not in the
          password file.

     Duplicate logname entry
          A login name in the list of login names has already been assigned to
          that group, either by a previous group with the same group ID or the
          default group that was set in the password file or the login name is
          in the same group entry multiple times.
     Maximum groups exceeded for logname
          Number of groups assigned to single login name has been exceeded
          (See sysconf(1) - NGROUPS_MAX).

     Out of memory
          Failure to malloc memory.