I didn't either, but if I needed help with a command- I'd consult the manpages first. But then again, I learned unices back in the days before resources were easily searchable online, and multiple flavors as well. Solaris, BSD, Linux, etc. They all had slightly different flags and it was always wise to check.

Sitting in a datacenter, with no wifi and working on a downed server... you learn to appreciate the manpages at the console.