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sg [-] [group [-c ] command]
The sg command works similar to newgrp but accepts a command. The
command will be executed with the /bin/sh shell. With most shells you
may run sg from, you need to enclose multi-word commands in quotes.
Another difference between newgrp and sg is that some shells treat
newgrp specially, replacing themselves with a new instance of a shell
that newgrp creates. This doesn?t happen with sg, so upon exit from a
sg command you are returned to your previous group ID.
The following configuration variables in /etc/login.defs change the
behavior of this tool:
Enable "syslog" logging of sg activity.
User account information.
Secure user account information.
Group account information.
Secure group account information.
id(1), login(1), newgrp(1), su(1), gpasswd(1), group(5), gshadow(5).
User Commands 07/24/2009 SG(1)