(100 points) Create a shell from scratch which can read scripts. Code this in C/C++. Should be able to do the following commands:

echo prints out text

echo $? prints out exit code of previous command

!! repeates last command given to shell

exit exits shell with a given code 0-255, and number larger should be trunckated. This can be done either by using the exit() system call or return from the main function the exit code

Other details:

• When no other command listed is used the Shell will print out "Incorrect command"
• When the user gives an empty command, the shell gives a new prompt.
• At minnimum should be able to run the program below

## run.sh echo run echo running echo ran !! exit 10

$ ./myShell test.sh run running ran ran $ echo $? 10 $