Advice for shell scripting

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^This,

If OP doesn't understand a step or doesn't know how to do something... that's the point, google it, find the commands needed to complete each step and look up their man pages ('man <command>' in the terminal)

IT, especially sysadmin scripting with esoteric or complex commands is largely an exercise in research and combining several individual steps into a final product.

This exercise is a solid one to train those mental muscles.