DragonFly On-Line Manual Pages
NEWGRP(1) DragonFly General Commands Manual NEWGRP(1)
newgrp -- change to a new group
newgrp [-l] [group]
The newgrp utility creates a new shell execution environment with
modified real and effective group IDs.
The options are as follows:
-l 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.
The newgrp utility attempts to start the shell regardless of whether
group IDs were successfully changed.
If an error occurs and the shell cannot be started, newgrp exits >0.
Otherwise, the exit status of newgrp is the exit status of the shell.
csh(1), groups(1), login(1), sh(1), su(1), umask(1), group(5), passwd(5),
The newgrp utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
A newgrp utility appeared in Version 6 AT&T UNIX.
For security reasons, the newgrp utility is normally installed without
the setuid bit. To enable it, run the following command:
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
DragonFly 4.3 November 24, 2013 DragonFly 4.3