Name and optimize a screengrab file

Control what happens to an image file after a screenshot is taken
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via Mitchell Cohen: Eight Terminal Utilities Every OS X Command Line User Should Know · mitchchn.me (mitchchn.me)

screencapture lets you take many different kinds of screenshots. It’s similar to Grab.app and the keyboard shortcuts cmd + shift + 3 and cmd + shift + 4, except it’s far more flexible.