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MULTGRPS(1)							   MULTGRPS(1)

NAME    [Toc]    [Back]

     multgrps -	spawn a	shell with membership in multiple groups

SYNOPSIS    [Toc]    [Back]

     multgrps [-]

DESCRIPTION    [Toc]    [Back]

     multgrps creates a	new shell process which	is simultaneously a member of
     all groups	to which the invoking user belongs.

     Every user	belongs	to a default group specified in	/etc/passwd.  Any
     additional	group memberships are listed in	the file /etc/group.
     Traditional System	V allows processes to be in only one group at any
     given time; that group may	be changed via the newgrp(1) command.  A
     process has group access privileges only to the files whose group ID
     matches the process's current value.  BSD and POSIX systems provide the
     capability	for processes to be members of more than one group at a	time.
     Since IRIX	is based on System V, processes	are in single-group mode by
     default.  The multgrps(1) command is analogous to newgrp(1) with the
     salient difference	that the new shell spawned by multgrps is a member of
     all groups	with which the user's login name is listed in /etc/group, in
     addition to the group defined in the /etc/passwd entry.

     multgrps initializes the group-set	of which the calling process (user) is
     a member.	It uses	an initgroups(3X) call to obtain the groups from the
     file /etc/group or	its NIS	equivalent, then spawns	a new shell which is a
     member of them all.  The user remains logged in and the current directory
     is	unchanged, but calculations of access permissions to files are
     performed with respect to the entire set of group IDs.  The user is
     always given a new	shell, replacing the current shell, by multgrps,
     regardless	of whether the user is a member	of any supplemental groups.
     In	that shell the first group in the list is always the group ID from the
     user's entry in the /etc/passwd file.

     Exported variables	retain their values after invoking multgrps; however,
     all unexported variables are either reset to their	default	value or set
     to	null.  System variables	(such as PS1, PS2, PATH, MAIL, and HOME),
     unless exported by	the system or explicitly exported by the user, are
     reset to default values.  For example, a user has a primary prompt	string
     (PS1) other than $	(default) and has not exported PS1.  After an
     invocation	of multgrps their PS1 will be set to the default prompt	string
     $.	 Note that the shell command export (see sh(1))	is the method of
     exporting variables so that they retain their assigned value when
     invoking new shells.

     If	the first argument to multgrps is a -, the environment is changed to
     what would	be expected if the user	actually logged	in again.

     The multiple-group	shell may be terminated	via "exit", which returns to
     the previous shell.

									Page 1

MULTGRPS(1)							   MULTGRPS(1)

     No	group password checking	is performed.  Since /etc/group	is a system
     file (writable only by superuser),	it is assumed that protection against
     unintended	group-membership is provided by	those restricted file

     The set of	active group IDs may be	displayed by invoking id(1) or
     groups(1).	 If multgrps has not been called only the group	ID from	the
     user's entry in /etc/passwd will be listed.

     The maximum number	of groups of which a process may be a member is
     defined (as an lbootable option) in /var/sysgen/master.d/kernel, named

FILES    [Toc]    [Back]

     /etc/group		 system	group file
     /etc/passwd	 system	password file

SEE ALSO    [Toc]    [Back]

     newgrp(1),	login(1), id(1), sh(1),	getgroups(2), setgroups(2),
     initgroups(3X), group(4), passwd(4), environ(5)

									PPPPaaaaggggeeee 2222
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