Bash script for password changes help

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# 1  
Old 10-15-2019
Bash script for password changes help

I am super new to scripting and I am trying to create a bash script that is interactive that will change other user passwords as well as a few other thing (ie. change SMB pw, see pw expiration,lock/unlock user).
I have started it by making it check to see if the username entered is in the etc/passwd file. Where do I start if I want it to then display an interactive menu once a valid username has been found? I also would like it to loop back to the menu until the user selects the exit option.
# 2  
Old 10-15-2019
Password systems are designed to stop you from doing what you're attempting to do. They do not accept input from a program, just a terminal. To get around this, you will need to use an insecure brute-forcing tool like expect.
# 3  
Old 10-15-2019
maybe I'm not being totally clear in my question. As operators we change other user passwords using sudo. we have a current script that we can run that gives a menu for the operator to choose from. I am trying to create a new script to do the same thing but improve it slightly but I'm trying to build it from scratch without looking at the current script so I can get the learning experience since I just got promoted to DBA in training.
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