How to batch rename files in OS X Yosemite

[iMore.com]

Up until OS X Yosemite, it was a pain the **** to batch-rename files - you either had to do it manually, arduously replacing the file names one by one, download a specialized utility, use some Terminal command-line wizardry, or perhaps resort to a tool like Apple's Automator utility. Not any more, thanks to Yosemite. Here's how!

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