newgrp.1

pwdutils是一套密码管理工具

.\" -*- nroff -*-
.\" Copyright (C) 2004 Thorsten Kukuk
.\" Author: Thorsten Kukuk <[e-mail]>
.\"
.\" This program is free software; you can redistribute it and/or modify
.\" it under the terms of the GNU General Public License version 2 as
.\" published by the Free Software Foundation.
.\"
.\" This program is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public License
.\" along with this program; if not, write to the Free Software Foundation,
.\" Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
.\"
.TH newgrp 1 "April 2004" "pwdutils"
.SH NAME
newgrp \-  change effective group ID
sg \- execute command with different group ID
.SH SYNOPSIS
.B newgrp
[\fB-l\fR] [\fIgroup\fR]
.br
.B sg
\fIgroup\fR \fB-c \fIcommand\fR
.SH DESCRIPTION
The \fBnewgrp\fR command changes the user's real and effetive group ID
by replacing the current shell with a new shell. A new shell is launched
even if an error occours.
.PP
A password is requested if the group has a password and the user is not
listed in the group file as being a member of that group. The password
can be changed with the
.BR gpasswd (1)
command.
.PP
If the new effective group ID is not in the supplementary group list,
\fBnewgrp\fR will add the new group ID to the supplementary list, too.
.PP
With no operands and options, \fBnewgrp\fR changes the user's group IDs
(real and effective) back to the group specified in password and group
file.
.PP
The \fBsg\fR command works like the \fBnewgrp\fR command, except that
it executes the given command with \fB/bin/sh\fR and upon exit the
group ID of the current shell is not changed.
.SH OPTIONS
.TP
\fB\-l\fR, \fB\-\-login\fR
reinitialize the environment as if the user logged in.
.TP
\fB\-\-help\fR
Print a help list.
.TP
\fB\-u\fR, \fB\-\-usage\fR
Print a short usage message.
.TP
\fB\-v\fR, \fB\-\-version\fR
Print program version.
.SH "SEE ALSO"
.BR gpasswd (1),
.BR group (5),
.BR passwd (1),
.BR passwd (5),
.BR su (1)
.SH AUTHOR
Thorsten Kukuk <[e-mail]>