To run:
gcc shell.c
./a.out

Inbuilt functions that have been implemented:
history: shows the names of all executed commands so far
cd: Default behaviour of cd has been implemented. So if no path is supplied to cd it changes directory to /home/ by default.
pwd
echo
pinfo
fg
overkill
kjobs

On running a ./a.out inside the shell it executes as normal and on quit it has been set to the quit the main terminal as well