6. Can you run multiple versions of ./b.sh in the background? What happens to their output?

7. Can you execute a second instance of our shell from within our shell program (use './shell')? Which shell receives your input?

8. What happens if you type CTRL-C while the countdown script ./b.sh is running? What if ./b.sh is running in the backgroun

9. Can a shell kill itself? Can a shell within a shell kill the parent shell?

./shell

./shell

/bin/kill -s KILL NNN (Where NNN is the the parent's PID.)

10. What happens to background processes when you exit from the shell? Do they continue to run? Can you see them with the 'ps' command?

./shell

./b.sh&

exit ps