--- a/sudo.rst	Fri Jul 01 21:56:16 2011 +0300
+++ b/sudo.rst	Sat Jul 09 01:53:59 2011 +0300
@@ -8,3 +8,11 @@
 
   @group ALL =(ALL) NOPASSWD: ALL
 
+* Change user/primary group for executed command.
+
+  $ sudo -u $user -g $group $command
+
+To allow this plase in /etc/sudoers:
+
+  username ALL =(ALL:ALL) NOPASSWD: ALL
+