mkdir’s “-p” option

So this doesn’t seem like a terribly complicated question I have, but it’s one I can’t find the answer to. I’m confused about what the -p option does in Unix. I used it for a lab assignment while creating a subdirectory and then another subdirectory within that one. It looked like this:

mkdir -p cmps012m/lab1

This is in a private directory with normal rights (rlidwka). Oh, and would someone mind giving a little explanation of what rlidwka means? I’m not a total noob to Unix, but I’m not really familiar with what this means. Hopefully that’s not too vague of a question.

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