CONFIGURATION
The following configuration variables in /etc/login.defs change the
behavior of this tool:
SYSLOG_SG_ENAB (boolean)
Enable "syslog" logging of sg activity.
/etc/passwd
/etc/shadow
/etc/group
/etc/gshadow
id(1), login(1), newgrp(1), su(1), gpasswd(1), group(5), gshadow(5).
04/09/2012 sg(1)