OS X
Quicksilver is a desktop app launcher.
Finder: Show All Files
To show hidden files in finder:
$ defaults write com.apple.finder AppleShowAllFiles TRUE $ killall Finder
To hide hidden files in finder:
$ defaults write com.apple.finder AppleShowAllFiles FALSE $ killall Finder
Note: the finder config file is:
~/Library/Preferences/com.apple.finder.plist