Solve : student linux?

1.	Solve : student linux?
Answer» hello, I'm very new to use linux. I'm taking lessons. But now I have a problem, PROBABLY very EASY, that I can't find the answer on it. My teacher ask me a command or commandline to DEFINE how many USERS can have acces to a system with linux on. Not to show how many users they already have been on my system ? I hope SOMEONE can help me solve it.

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