C Program development on creating shell

you will write a shell (a command line interpreter). The shell should operate in this
basic way: when you type in a command (in response to its prompt), the shell creates a child process that
executes the command you entered and then prompts for more user input when it has finished. The
shells you implement will be similar to, but much simpler than, the one you run every day in Unix. You can
find out which shell you are running by typing echo $SHELL at a prompt. You may then wish to look at the
man pages for sh or the shell you are running (more likely tcsh or bash) to learn more about all of the
functionality that can be present.