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NetBSD 6.1.5 - man page for newgrp (netbsd section 1)

NEWGRP(1)			   BSD General Commands Manual				NEWGRP(1)

     newgrp -- change to a new primary group

     newgrp [-l] [group]

     The newgrp command changes a user to a new primary group (real and effective group ID) by
     starting a new shell.  The user remains logged in and the current directory and file cre-
     ation mask remain unchanged.  The user is always given a new shell even if the primary group
     change fails.

     The newgrp command accepts the following options:

     -l      The environment is changed to what would be expected if the user actually logged in
	     again.  This simulates a full login.

     The group is a group name or non-negative numeric group ID from the group database.  The
     real and effective group IDs are set to group or the group ID associated with the group

     If group is not specified, newgrp 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.

     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.

     /etc/group 	 The group database
     /etc/master.passwd  The user database
     /etc/passwd	 A Version 7 format password file

     If a new shell is started the exit status is the exit status of the shell.  Otherwise the
     exit status will be >0.

     csh(1), groups(1), login(1), sh(1), su(1), umask(2), group(5), passwd(5), environ(7)

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

     A newgrp command appeared in Version 6 AT&T UNIX.	A newgrp command appeared in NetBSD 5.0.

     There is no convenient way to enter a password into /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.

BSD					   June 6, 2007 				      BSD

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