% ./tester
Enter quit to stop
enter a cmd line> ls -l -a 

Command line: ls -l -a 

  0  #ls#
  1  #-l#
  2  #-a#
run in the background is false

Command line: ls -l -a 

  0  #ls#
  1  #-l#
  2  #-a#
run in the background is false

enter a cmd line> yo ho ho &

Command line: yo ho ho &

  0  #yo#
  1  #ho#
  2  #ho#
run in the background is true

Command line: yo ho ho &

  0  #yo#
  1  #ho#
  2  #ho#
run in the background is true

enter a cmd line>        a            b             c     def   ghijk  lmnop q    &

Command line:       a            b             c     def   ghijk  lmnop q    &

  0  #a#
  1  #b#
  2  #c#
  3  #def#
  4  #ghijk#
  5  #lmnop#
  6  #q#
run in the background is true

Command line:       a            b             c     def   ghijk  lmnop q    &

  0  #a#
  1  #b#
  2  #c#
  3  #def#
  4  #ghijk#
  5  #lmnop#
  6  #q#
run in the background is true

enter a cmd line> pwd

Command line: pwd

  0  #pwd#
run in the background is false

Command line: pwd

  0  #pwd#
run in the background is false
enter a cmd line> quit