Linux Commands Examples

A great documentation place for Linux commands


execute command as different group ID

see also : id - login - newgrp - su - gpasswd


sg [-] [group [-c ] command]

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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.

see also

id , login , newgrp , su , gpasswd , group, gshadow.

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