Want to change the default time of 1 hour for TimeMachine backups, change the look of your dock, or hide a user account? Many of these hidden “features” can be performed on your Mac with a simple “defaults” command in the Terminal.
There used to be a great shareware app called Secrets to handle these with a click, but it hasn’t been updated for Lion. Now some kind soul has posted a huge lis of these commands on GitHub.
Use at your own risk, of course. I recommend simply cutting-and-pasting the command you want into the Terminal, and press return. If you type them wrong it could lead to trouble.