How can I make a file un-hidden permanently?
In Terminal defaults write com.apple.finder AppleShowAllFiles TRUE, relaunch  Finder. After that you'll see all your hidden files in Finder. 

Now type 

chflags nohidden


into Terminal and just drag&amp;drop file that you want to unhide on the line. Enter.

defaults write com.apple.finder AppleShowAllFiles FALSE will reverse Finder back to normal.