Now that you have the /etc/passwd file up, go ahead and add the following line:

testuser:x:3000:3000:LPI tutorial test user:/home/testuser:/bin/false

We've just added a "testuser" user with a UID of 3000. We've added him to a group with a GID of 3000, which we haven't created just yet. Alternatively, we could have assigned this user to the GID of the users group if we wanted. This new user has a comment that reads LPI tutorial test user; the user's home directory is set to /home/testuser, and the user's shell is set to /bin/false for security purposes. If we were creating an non-test account, we would set the shell to /bin/bash. OK, go ahead and save your changes and exit.