It's NOT a good idea to nice
foreground job (12.1
If the system gets busy, your terminal could "freeze" waiting to get enough
CPU time to do something.
You may not even be able to
'd job on a very busy system because the
CPU may never give the process enough CPU time to recognize the signal
waiting for it!
And, of course, don't nice
an interactive program like a text editor
unless you like to wait...