Best way to get player opreation system?

What is the best way to get a player’s opreation system (AKA WINDOWS MAC LINUX)?

Thanks.

[lua]
system.IsLinux( )
system.IsOSX( )
system.IsWindows( )
[/lua]

[editline]16th June 2014[/editline]

source: http://wiki.garrysmod.com/page/system

Thanks had no clue garry added that.

Mark the thread as solved.