group man page on HP-UX

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group(4)							      group(4)

       group, logingroup - group file, grp.h

       contains for each group the following information:

	      ·	 group name
	      ·	 encrypted password
	      ·	 numerical group ID
	      ·	 comma-separated list of all users allowed in the group

       The  file  is  an ASCII file.  Fields are separated by colons, and each
       group is separated from the next by a new-line.	No spaces should sepa‐
       rate  the fields or parts of fields on any line.	 If the password field
       is null, no password is associated with the group.

       There are two files of this form in the system, and The file exists  to
       supply names for each group, and to support changing groups by means of
       the utility (see newgrp(1)).  provides a default group access list  for
       each user via and (see login(1) and initgroups(3C)).

       The  real  and effective group ID set up by for each user is defined in
       (see passwd(4)).	 If is empty, the default group access list is	empty.
       If and are links to the same file, the default access list includes the
       entire set of groups associated with the	 user.	 The  group  name  and
       password	 fields	 in are never used; they are included only to give the
       two files a uniform format, allowing them to be linked together.

       All group IDs used in or should be defined in

       These files reside in directory Because	of  the	 encrypted  passwords,
       these  files  can  and do have general read permission and can be used,
       for example, to map numerical group IDs to names.

       The group structure is defined in and includes the following members:

       The file can contain a line beginning with a plus which means to incor‐
       porate  entries from Network Information Services (NIS).	 There are two
       styles of entries: means to insert the entire  contents	of  NIS	 group
       file  at	 that  point,  and means to insert the entry (if any) for name
       from NIS at that point.	If a entry has a non-null  password  or	 group
       member  field,  the contents of that field overide what is contained in
       NIS.  The numerical group ID field cannot be overridden.

       A group file can also have a line beginning with a minus these  entries
       are  used to disallow group entries.  There is only one style of entry;
       an entry that consists of means to disallow any	subsequent  entry  (if
       any)  for name.	These entries are disallowed regardless of whether the
       subsequent entry comes from the NIS or the local group file.

       Group files must not contain any blank lines.  Blank  lines  can	 cause
       unpredictable  behavior	in  system  administration  software that uses
       these files.

       Group ID (gid) 9 is reserved for the Pascal Language  operating	system
       and  the	 BASIC Language operating system.  These are operating systems
       for Series 300/400 computers that can co-exist with HP-UX on  the  same
       disk.   Using this gid for other purposes can inhibit file transfer and

       The length of each line in is limited to as defined in Because of  this
       limit,  users  should  not  be  listed in their primary group - only in
       their additional groups.

       If is linked to group membership for a user is managed by NIS,  and  no
       NIS  server  is able to respond, that user cannot log in until a server
       does respond.

       There is no single tool available to completely	ensure	that  and  are
       compatible.   However,  and  can	 be  used  to  simplify	 the task (see

       There is no tool for setting group passwords in

       Here is a sample file:

       Group has a gid of 1 and members and The	 group	is  ignored  since  it
       appears	after  the entry Also, the group has members and and the pass‐
       word and group ID of the NIS entry for the group All groups  listed  in
       the NIS are pulled in and placed after the entry for The plus and minus
       features are part of NIS.  Therefore if NIS  is	not  installed,	 these
       features cannot work.

       groups(1), newgrp(1), passwd(1), setgroups(2), crypt(3C), getgrent(3C),
       initgroups(3C), passwd(4).


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