Yeah, so with the commands file, a process is created and runs the first command in the file (shortsleep in this case), with the other commands in the file being possible commands that could be called by the first command (or any processes that the first command's process spawns, or any processes that they spawn and so on). So the command file just lists possible commands, and the first of those commands is loaded into a process. From then on, you just have to simulate that process and ensure it can execute the syscalls in the command it runs. Like I use structs to represent most of my things. Like syscalls, the commands that contain the syscalls, and then the processes that contain a specific command. So you really just need to read the commands and syscalls from the file and add them into those structs, and then just refer to those structs during the simulation, possibly through pointers for ease.