change to a new group
utility creates a new shell
execution environment with modified real and effective group IDs.
The options are as follows:
- Simulate a full login. The environment and umask are set to what would be
expected if the user actually logged in again.
If the group
operand is present, a new shell is
started with the specified effective and real group IDs. The user will be
prompted for a password if they are not a member of the specified group.
Otherwise, the real, effective and supplementary group IDs are restored to those
from the current user's password database entry.
utility attempts to start the
shell regardless of whether group IDs were successfully changed.
If an error occurs and the shell cannot be started,
exits >0. Otherwise, the exit
is the exit status of the
utility conforms to
IEEE Std 1003.1-2001
utility appeared in
Version 6 AT&T UNIX
For security reasons, the
normally installed without the setuid bit. To enable it, run the following
chmod u+s /usr/bin/newgrp
Group passwords are inherently insecure as there is no way to stop users
obtaining the password hash from the group database. Their use is discouraged.
Instead, users should simply be added to the necessary groups.