Copyright (c) 2007, The NetBSD Foundation.
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This code is derived from software contributed to The NetBSD Foundation
by Brian Ginsbach.
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.Dd June 6, 2007 .Dt NEWGRP 1 .Os .Sh NAME .Nm newgrp .Nd change to a new primary group .Sh SYNOPSIS .Nm .Op Fl l .Op Ar group .Sh DESCRIPTION The .Nm command changes a user to a new primary group
q real and effective group ID by starting a new shell. The user remains logged in and the current directory and file creation mask remain unchanged. The user is always given a new shell even if the primary group change fails.
p The .Nm command accepts the following options: l -tag -width indent t Fl l The environment is changed to what would be expected if the user actually logged in again. This simulates a full login. .El
p The .Ar group is a group name or non-negative numeric group ID from the group database. The real and effective group IDs are set to .Ar group or the group ID associated with the group name.
p If .Ar group is not specified, .Nm restores the user's real and effective group IDs to the user's primary group specified in the password database. The user's supplementary group IDs are restored to the set specified for the user in the group database.
p If the user is not a member of the specified group, and the group requires a password, the user will be prompted for the group password. .Sh EXIT STATUS If a new shell is started the exit status is the exit status of the shell. Otherwise the exit status will be \*[Gt]0. .Sh FILES l -tag -width /etc/master.passwd -compact t Pa /etc/group The group database t Pa /etc/master.passwd The user database t Pa /etc/passwd A Version 7 format password file .El .Sh SEE ALSO .Xr csh 1 , .Xr groups 1 , .Xr login 1 , .Xr sh 1 , .Xr su 1 , .Xr umask 2 , .Xr group 5 , .Xr passwd 5 , .Xr environ 7 .Sh STANDARDS The .Nm command conforms to .St -p1003.1-2001 . .Sh HISTORY A .Nm command appeared in .At v6 . A .Nm command appeared in .Nx 5.0 . .Sh BUGS There is no convenient way to enter a password into
a /etc/group . The use of group passwords is strongly discouraged since they are inherently insecure. It is not possible to stop users from obtaining the encrypted password from the group database.