January 25

Change the Default Screen Shot Image Type

you can change the default file type from PNG to JPG or a variety of other options with a defaults write command.
JPG offers the best file size and compression while still looking decent:

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January 17

Change Where Screen Shots Are Saved To

If you take a lot of screenshots you know how fast your desktop gets littered with them.
The best solution is to create a new folder in /Pictures/ or ~/Documents/ and then set that to the new default screen shot save location with a defaults write command:

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January 2

Always Show the User Library Folder

A simple command lets the user ~/Library always be shown.
This isn’t a defaults write command but it’s very useful if you frequently dig around in that directory, and you may as well make the change while you’re in the terminal.

Most of these commands will be usable in all versions of OS X, though obviously things that require something like Mission Control is only going to work in Lion, Mountain Lion, and onward.

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