In the old days, your OS would come with a paper manual describing all the commands in great detail. Nowadays the OS is so complex that you can’t be expected (and don’t really need to) know all the commands that are there. But getting one of those old UNIX/early Linux manuals and reading through it would be a great start.




I’ll be real with you. What you need to do is, whenever faced with a task that sounds like it needs CLI, go search stackoverflow for that task. It probably has something slightly relevant to what you need, you take the commands from that answer and read their manuals.