Terminal help - accidentally deleted /System/Library/Extensions

So I foolishly deleted my entire Extensions folder. I only trashed it though, not emptied. But I can't boot up. The only way I can get into anything is by using the retail Snow Leopard CD. From here I can get to the terminal.
So...
Can I restore my files from the trash via the terminal in the install cd?
I've been trying some commands but no luck so far.
Help is greatly appreciated.

Perfect. It took a little tweaking. First I had to create the "Extensions" directory again, and even then it wouldn't let me move a whole directory, just individual files. The "-R" command worked that out though.
The full code I ended up using was...
cp -R /Volumes/"Hard Drive"/.Trashes/*/Extensions /Volumes/"Hard Drive"/System/Library/Extensions

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