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    () does spawn subshell..perhaps you meant {}.... Commented Dec 3, 2015 at 18:36
  • @heemayl, that's the other part of my question—is there some way I can see or demonstrate on my screen the fact of a subshell being spawned? (That could really be a separate question but would be good to know here.) Commented Dec 3, 2015 at 18:43
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    @heemayl You're right! I had done echo $$ && ( echo $$ ) to compare the PID's and they were the same but just before I submitted the comment telling you you were wrong I tried one other thing. echo $BASHPID && ( echo $BASHPID ) gives different PID's Commented Dec 3, 2015 at 18:44
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    @heemayl echo $BASHPID && { echo $BASHPID; } give the same PID as you suggested would be the case. Thanks for the education Commented Dec 3, 2015 at 18:44
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    @Ruslan, David King: I've edited the answer to emphasize the accurate information which I found so helpful, and to remove the inaccurate points. Commented Sep 10, 2016 at 2:12