List of Usernames on Server

Here is a very basic question:

Does anyone know how to get a listing of all the users that have been created on a Apache/Red Hat 7.2 server?

I have come across the commands to add and delete users:
useradd and userdel

But can't find out how to get a list of all the users that have been added/created on the server. Also, if logged in as root is there a way to see what the password is for each username?

Thanks in advance.

 

 

 

 

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