On: OS X Command Line Utilities

[fuzzywalrus]

Notably the screen capture terminal command, while neat, is sold as "more flexible". I think the author is unaware of Command+shift+4 followed by tapping the spacebar. It'll give you the window capture.

Otherwise good article.

[wilmoore → fuzzywalrus]

If you have Cloudup installed, that command sequence will also upload the screenshot automatically.

https://cloudup.com/about