Hi, I am unsure of how I am meant to go about storing the command file detail for retrieval later when doing the execute command function. I am thinking of doing a command array of structures which holds each command and an array of structures containing the system calls. Though, I am thinking because there are different types of system calls with different values in them, I would make separate structures and then join them in a single structure using a union. To me this makes more organisational sense, but I am just wondering if there is another way to go about it? Or if my way would even work... Thanks.