Brian,

About OSX jhs701.app which opens a Terminal window and executes -

   /Applications/j701/bin/jhs.command ; exit;

If the second Unix command (exit) is omitted, then the window stays 
live and it is easy to restart j by picking the previous line.

Typing exit'' as jijx input is one way to kill the engine (but again, 
easily restarted in the Terminal window). Another way is to do 
<cntrl>\ in the Terminal window which quits jhs.command and in either 
case it can be restarted by executing the previous line. If you don't 
want the Terminal, you can quit it (which will also kill j - after 
asking if that's what you want).

All of this is likely the result of a "non-default" setting in my 
Terminal preferences - namely, the "When the shell exits: Don't close 
the window". Perhaps one of the hazards of jhs.command using the 
Terminal environment. On the other hand, I have long preferred using 
the Terminal (and jconsole) to run j, choosing it over the GUI.
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