sg man page
sg — execute command as different group ID
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:
- SYSLOG_SG_ENAB (boolean)
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).
credentials(7), group(5), newgrp(1).