Pretty easy,
Clone or download as .zip
Use WSL(I used this), a linux distro terminal or MacOS terminal to compile and run the code.
In the terminal, navigate to the folder where you have cloned / unzipped the code.
Then, run gcc Shell_project.c job_control.c job_control.h -o Shell to compile.
After compiling successfully, just type ./Shell in the folder the code was compiled in and it'll be up and running.
To install gcc compiler on Linux, WSL or MacOS terminal use sudo apt-get install gcc