Programming :: Bash Script - Executing Answer To Another Script?

I have a simple BASH script that I want to make it execute USERNAME and PASSWORD to another bash script and htdigest. But After passwd, with htdigest and the script rustart, I have to manual enter the answers.

#!/bin/bash
echo -n "What is the user name?"
read -e USERNAME

[code]....

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This will ask me for username and password, but I want it to take the username and password from $USERNAME and $PASSWORD

service rustart restart

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This script needs a username to restart another exec, but I don't wana have to manually type in the username, I just want it to automatically fill in the $USERNAME