I have some long-running tasks that I would like to throw into the 
background with STDOUT and STDERR directed to a file and with the standard 
interactive REPL behavior regarding "show"ing the result of an evaluation 
that is not followed by a ';'.  I am thinking of something like R's CMD 
BATCH invocation.  Can someone direct me to a discussion or manual section 
that will give me a clue?

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