In all three options, you can choose to put the numbers before or after the base filename. Date adds the current date and time to the base filename. Index uses the number alone, whereas Counter pads the number with zeros, as in the above example. Index and Counter let you specify a string number from which to count up. In all three, you give it a base filename. In this option, you can choose Name and Index, Name and Counter, or Name and Date. If they can be trusted to do it, that is. Now, the Finder has powerful bulk-renaming tools built in, so you can just take care of it all in a couple of minutes, and have your intern make you a coffee instead. In the olden days, you would have to either a) research, download, buy, and learn to use a new bulk-renaming app or b), punish your intern by making them correct everything by hand, before finally resorting to a) anyway because the intern screwed it up again. Do you have a folder full of photos named IMG_00xx.JPG that need to be called dads_wedding_00x.jpg instead? Or perhaps that intern spelled the company name wrong on every single one of a hundred files, and you need to correct that word on every file? But what if you want to rename a whole bunch of files at once? Maybe you want to add the same text to the beginning of every file, or add a number to the end of a folder full of MP3 recording to keep them in the right order. You can click on its name and type in a new one. Renaming a single file in the Finder isn’t too bad.

Bulk rename tool