by A frequent question we receive about OS X is “How do I change my short username?” While it’s easy to change your full username—an easily-accessible setting in the Users & Groups pane of System Preferences—there’s no obvious way to change the short username, which is also the name of your home folder in the Finder.
Prior to Mac OS X 10.5 Leopard, changing your short username was a complicated, risky procedure. In fact, it was so complex that even Apple’s own instructions weren’t exhaustive. Because of this, a colleague and I wrote a special utility for pre-Leopard versions of OS X, ChangeShortName, that did the job right.
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