How Do I Set the Screen Capture Location With Terminal?

A couple years ago I set up a screen capture folder on my powerbook based on the video “Setting Screenshot File Location (#1347)”. I just got a new iMac and would like to do the same set up. Do I need to rewrite the terminal code or is there a location on my powerbook where I can copy that terminal code (or file) and past (or move) it to my iMac?
—–
Lucian