The following is a demonstration of the osstat command. It is a 
convenient way to determine if your OS is upgraded while you are using it.

Here we print out the OS version per second, 10 times.

   $ osstat 1 10
       TIME OS_Ver               u/s r/s i/s b/s
   16:29:17 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:18 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:19 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:20 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:21 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:22 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:23 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:24 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:25 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:26 SunOS_5.9            0.0 0.0 0.0 0.0
   16:29:27 SunOS_5.9            0.0 0.0 0.0 0.0

Included in the output is,
	u/s - upgrades per second
	r/s - reboots per second
	i/s - initial installs per second
	b/s - BFUs per second (builds)