well this is for the very rare case of a non network managed machine which the users would set up local accounts and administer basically them self. However, they have requested an easy way to create and manage their own local user accounts so I was looking at making an interactive script. Which in return after that, I can make it sit on the local admin account's desktop and make an apple script to execute the shell script to make it double click executable. Then all they need to do is input the info in the open terminal screen and exit when finished.

There will be one person with admin rights and the rest of the accounts will be managed.

I have written plenty of simple shell scripts in my time but never one fully interactive, other than a menu based shell script that just ran commands by inputting 1, 2, 3, 4 etc, and 0 to exit. I have never written anything that actually asked for input, and then took that input and inserted it into a script.