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Linux 2.6 - man page for sg (linux section 1)

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SG(1)					  User Commands 				    SG(1)

       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).

User Commands				    06/24/2011					    SG(1)
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