Mac: changing screenshots location

mkdir ~/Desktop/screenshots

defaults write com.apple.screencapture location ~/Desktop/screenshots

killall SystemUIServer

1. Creates a directory in /Users/username/Desktop/screenshots.
2. Sets the default screenshot location to that directory.
3. Restarts the service responsible for screenshots.

New screenshots (?+Shift+3, 4 or 5) are now stored in ~/Desktop/screenshots.