Question: How do I see all of the users that have accounts on my server?
Answer: In a previous post, we covered the “who” command, which will tell an administrator which users are currently logged into the system, but another important thing to know about your server is which users you actually have. You will want to look at a complete list of users to make sure all the existing users are supposed to be there.
To list all users, enter the following command:
cat /etc/passwd | cut -d":" -f1
Also, to find out the total number of accounts, enter:
cat /etc/passwd | wc -l
Please note that this will look for all accounts, including those created by Linux, such as “mail” and “haldaemon”, but it will also include manually created local users.