How do I undo these commands from terminal?

I was trying to copy music from my iPod to my mac, so I copy & pasted these two commands into terminal:
defaults write com.apple.finder AppleShowAllFiles TRUE
killall finder
Now there's an icon on my desktop that i can't delete that says ".DS_Store and I can't open it with any of my applications.
Please help!
Thanks

Not sure, try this:
defaults write com.apple.finder AppleShowAllFile FALSE
then
killall Finder

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How do I undo these commands from terminal?

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