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'\" t
.\" Title: newgrp
.\" Author: Julianne Frances Haugh
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 11/08/2022
.\" Manual: User Commands
.\" Source: shadow-utils 4.13
.\" Language: English
.\"
.TH "NEWGRP" "1" "11/08/2022" "shadow\-utils 4\&.13" "User Commands"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
newgrp \- log in to a new group
.SH "SYNOPSIS"
.HP \w'\fBnewgrp\fR\ 'u
\fBnewgrp\fR [\-] [\fIgroup\fR]
.SH "DESCRIPTION"
.PP
The
\fBnewgrp\fR
command is used to change the current group ID during a login session\&. If the optional
\fB\-\fR
flag is given, the user\*(Aqs environment will be reinitialized as though the user had logged in, otherwise the current environment, including current working directory, remains unchanged\&.
.PP
\fBnewgrp\fR
changes the current real group ID to the named group, or to the default group listed in
/etc/passwd
if no group name is given\&.
\fBnewgrp\fR
also tries to add the group to the user groupset\&. If not root, the user will be prompted for a password if she does not have a password (in
/etc/shadow
if this user has an entry in the shadowed password file, or in
/etc/passwd
otherwise) and the group does, or if the user is not listed as a member and the group has a password\&. The user will be denied access if the group password is empty and the user is not listed as a member\&.
.PP
If there is an entry for this group in
/etc/gshadow, then the list of members and the password of this group will be taken from this file, otherwise, the entry in
/etc/group
is considered\&.
.SH "CONFIGURATION"
.PP
The following configuration variables in
/etc/login\&.defs
change the behavior of this tool:
.PP
\fBSYSLOG_SG_ENAB\fR (boolean)
.RS 4
Enable "syslog" logging of
\fBsg\fR
activity\&.
.RE
.SH "FILES"
.PP
/etc/passwd
.RS 4
User account information\&.
.RE
.PP
/etc/shadow
.RS 4
Secure user account information\&.
.RE
.PP
/etc/group
.RS 4
Group account information\&.
.RE
.PP
/etc/gshadow
.RS 4
Secure group account information\&.
.RE
.SH "SEE ALSO"
.PP
\fBid\fR(1),
\fBlogin\fR(1),
\fBsu\fR(1),
\fBsg\fR(1),
\fBgpasswd\fR(1),
\fBgroup\fR(5), \fBgshadow\fR(5)\&.
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