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group(4)			 File Formats			      group(4)

NAME
       group - group file

DESCRIPTION
       The  group file is a local source of group information. The  group file
       can be used in conjunction with other group sources, including the  NIS
       maps  group.byname and  group.bygid and the NIS+	table  group. Programs
       use the getgrnam(3C) routines to	access this information.

       The  group file contains	a one-line entry for each group	recognized  by
       the system, of the form:

	      groupname:password: gid:user-list

       where

       groupname
	     The name of the group.

       gid   The group's unique	numerical ID (GID) within the system.

       user-list
	     A comma-separated list of users allowed in	the group.

       The maximum value of the	 gid field is 2147483647. To maximize interop-
       erability and compatibility, administrators are recommended  to	assign
       groups using the	range of  GIDs below 60000 where possible.

       If  the	password  field	is empty, no password is demanded. During user
       identification and authentication, the supplementary group access  list
       is initialized sequentially from	information in this file. If a user is
       in more groups than the system  is  configured  for,  {NGROUPS_MAX},  a
       warning	will  be given and subsequent group specifications will	be ig-
       nored.

       Malformed entries cause routines	that read this file to halt, in	 which
       case group assignments specified	further	along are never	made.  To pre-
       vent this from  happening,  use grpck(1B) to check the /etc/group data-
       base from time to time.

       Previous	 releases  used	a group	entry beginning	with a `+' (plus sign)
       or `-' (minus sign) to selectively incorporate entries  from  NIS  maps
       for   group.  If	 still	required,  this	 is  supported	by  specifying
       group:compat in nsswitch.conf(4). The ``compat''	source may not be sup-
       ported  in  future  releases. The preferred sources are,	``files'' fol-
       lowed by	``nisplus''. This has the effect of incorporating  the	entire
       contents	of the NIS+ group table	after the  group file.

EXAMPLES
       Example 1: Sample of a group file.

       Here is a sample	 group file:

       root::0:root
       stooges:q.mJzTnu8icF.:10:larry,moe,curly

       and the sample group entry from nsswitch.conf:

       group: files nisplus

       With these entries, the group stooges will have members larry, moe, and
       curly, and all groups listed in the NIS+	group  table  are  effectively
       incorporated after the entry for	 stooges.

       If the  group file was:

       root::0:root
       stooges:q.mJzTnu8icF.:10:larry,moe,curly
       +:

       and the group entry from	nsswitch.conf:

       group: compat

       all  the	 groups	 listed	 in the	NIS group.bygid	and  group.byname maps
       would be	effectively incorporated after the entry for stooges.

SEE ALSO
       groups(1), grpck(1B),  newgrp(1),  getgrnam(3C),	 initgroups(3C),  nss-
       witch.conf(4), unistd(3HEAD)

       System Administration Guide: Basic Administration

SunOS 5.9			  14 May 1998			      group(4)

NAME | DESCRIPTION | EXAMPLES | SEE ALSO

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