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    Thanks, I learned a little more than I asked from your answer. I would vote up your answer also, but I'm not allowed yet and I flagged the accepted answer on the 1st one. Commented Apr 28, 2014 at 16:28
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    Thanks, I that's what I was hoping for. And a vote up is less meaningful than hearing your appreciation! Commented Apr 28, 2014 at 17:14
  • To clarify your comment under the first line of code: Yes, with the unset A variable bash expands $A to an empty string but to avoid confusion I would not use "" because the code is not equivalent to A="b" echo "". There will be no argument to echo. Commented Jun 15, 2015 at 15:10
  • Thanks. I was confused about TERM=vt100 echo $TERM showing the old value of $TERM but TERM=vt100 htop works with the new $TERM value. Your answer clears it up. Commented Feb 11 at 5:27