When do we run a shell in the UNIX system? How will you tell which shell you are running?

Answer 1

To check this you can simply do the Echo $RANDOM.

The results will be:

- Undefined variable if you are from the C-Shell, 

- A return prompt if you are from the Bourne shell, 

- A 5 digit random number if you are from the Korn shell. You could also do a ps -l and look for the shell with the highest PID.