2007-10-18 01:07:49 +04:00
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.\" $NetBSD: newgrp.1,v 1.2 2007/10/17 21:07:49 christos Exp $
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2007-06-21 18:09:23 +04:00
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.\"
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.\" Copyright (c) 2007, The NetBSD Foundation.
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.\" All Rights Reserved.
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2007-10-18 01:07:49 +04:00
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.\"
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2007-06-21 18:09:23 +04:00
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Brian Ginsbach.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgment:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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2007-10-18 01:07:49 +04:00
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.\"
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2007-06-21 18:09:23 +04:00
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 6, 2007
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.Dt NEWGRP 1
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.Os
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.Sh NAME
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.Nm newgrp
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.Nd change to a new primary group
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.Sh SYNOPSIS
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.Nm
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.Op Fl l
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.Op Ar group
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.Sh DESCRIPTION
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The
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.Nm
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command changes a user to a new primary group
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.Pq real and effective group ID
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by starting a new shell.
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The user remains logged in and the current directory
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and file creation mask remain unchanged.
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The user is always given a new shell even if
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the primary group change fails.
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.Pp
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The
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.Nm
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command accepts the following options:
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.Bl -tag -width indent
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.It Fl l
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The environment is changed to what would be expected if the user
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actually logged in again.
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This simulates a full login.
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.El
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.Pp
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The
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.Ar group
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is a group name or non-negative numeric group ID from the group database.
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The real and effective group IDs are set to
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.Ar group
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or the group ID associated with the group name.
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.Pp
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If
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2007-06-21 18:09:23 +04:00
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.Ar group
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is not specified,
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.Nm
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restores the user's real and effective group IDs to the user's
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primary group specified in the password database.
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The user's supplementary group IDs are restored to the set specified
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for the user in the group database.
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.Pp
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If the user is not a member of the specified group, and the group
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requires a password, the user will be prompted for the group password.
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.Sh EXIT STATUS
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If a new shell is started the exit status is the exit status of the shell.
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Otherwise the exit status will be \*[Gt]0.
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.Sh FILES
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.Bl -tag -width /etc/master.passwd -compact
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.It Pa /etc/group
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The group database
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.It Pa /etc/master.passwd
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The user database
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.It Pa /etc/passwd
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A Version 7 format password file
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.El
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.Sh SEE ALSO
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.Xr csh 1 ,
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.Xr groups 1 ,
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.Xr login 1 ,
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.Xr sh 1 ,
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.Xr su 1 ,
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.Xr umask 2 ,
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.Xr group 5 ,
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.Xr passwd 5 ,
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.Xr environ 7
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.Sh STANDARDS
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The
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.Nm
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command conforms to
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.St -p1003.1-2001 .
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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A
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.Nm
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command appeared in
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.Nx 5.0 .
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.Sh BUGS
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There is no convenient way to enter a password into
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.Pa /etc/group .
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The use of group passwords is strongly discouraged
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since they are inherently insecure.
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It is not possible to stop users from obtaining the encrypted
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password from the group database.
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