Terminal shows old computer name (after migration)

After using migration assistant (over Ethernet) from a 2007 mini to a mid-2011 mini:    the Terminal shows the old computer name in the prompt.
(Many other oddities -- every file action brings up "Finder wants to make changes" and requires a password, to move or copy or delete any file).    I see this problem has been reported before over the  years but I did not find any answer that didn't have further questions

Aha, changing it in "Sharing" seems to have worked for me (suggestion from 'Kappy' in the 2008 "Re: Migration: (UNIX) thread, although it did not work for others in that thread at the time):

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