This is a quick and easy tip for the day.

imadmac:~ madflojo$ uname -a  
Darwin imadmac.local 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64 x86_64

The example is from my imac but it works on unix/linux in general.