Ever needed to change finder’s lock bit on a file from the command line? Well, it isn’t really a finder thing. To wit:
# Lock a file $ chflags uchg /my/favorite/file # Unlock a file $ chflags nouchg /my/favorite/file
I would say this is useful given that the OS likes to automatically lock inactive files, but that feature was apparently stripped from Mountain Lion. Too bad, really; I actually kinda liked it (though I’m apparently the only one!).