Command wc-1 returns illegal option

Question

I'm working my way through a unix tutorial. Contrary to the expectations bestowed upon me by the tutorial when I enter the command

wc -1

I get the following

wc: illegal option -- 1
usage: wc [-clmw] [file ...]

Can anyone explain this and how i can use wc -1 to determine how many users are logged in

Answer 1

maybe it was

wc -l

l for larry not number 1.