Hiding the dock using the type command

[Terry Judd]

I need to hide the (OSX) dock and thought this would be straightforward
using the type command...

Type "d" with command,option

...but it doesn't work

I'm wondering whether this problem is due to the fact that I'm using two
modifier keys as other shortcuts that only use a single modifier seem to
work fine. I know I can work around this by using applescript...

tell application "System Events"
    keystroke "d" using {command down, option down}
end tell

...but I shouldn't have to - should I?

Terry...