How do I clear notifications using ADB shell

I know I can unlock the screen, pull down the notifications, and press the clear notifications button, but there's got to be a way to clear the notifications through `ADB`, right? I'm guessing it's some `Intent` sent through the 'am' command, or maybe something even simpler, but I can't seem to find anything on the net. All I'm getting is `Java` code for use with an `apk`. Edit: I should probably mention that I'm running on 4.3, sometimes commands may vary between versions.