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newgrp(1)                 BSD General Commands Manual                newgrp(1)


NAME

     newgrp -- change to a new group


SYNOPSIS

     newgrp [-l] [group]


DESCRIPTION

     The newgrp utility creates a new shell execution environment with modi-
     fied 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 speci-
     fied effective and real group IDs.  The user will be prompted for a pass-
     word 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.


EXIT STATUS

     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.


SEE ALSO

     csh(1), groups(1), login(1), sh(1), su(1), umask(1), group(5), passwd(5),
     environ(7)


STANDARDS

     The newgrp utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').


HISTORY

     A newgrp utility appeared in Version 6 AT&T UNIX.


BUGS

     Group passwords are inherently insecure as there is no way to stop users
     obtaining the crypted passwords from the group database.  Their use is
     discouraged.

BSD                              May 23, 2002                              BSD

Mac OS X 10.6.5 - Generated Fri Nov 12 06:00:47 CST 2010
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