Thanks for bringing this up. It does mostly work the same with shell but the -p flag of read isn't available with POSIX compliant shell. I ended up changing tha

Thanks for bringing this up. It does mostly work the same with shell but the -p flag of read isn't available with POSIX compliant shell. I ended up changing that slightly and pushed a patch to use sh now. Every other feature of the script worked the same with sh without modification. As for using #!/bin/bash instead of #!/usr/bin/env bash, that was an oversight from 2 years ago. I addressed that too in the above patch by using #!/usr/bin/env sh.