Remove `exec bash` from the script and set an alias for your script that looks like: `alias uni=". script_name.sh"`. Note the "." in the alias, "." is an alias for `source` which imports code to the shell, because you need this code in your current shell, not in a new shell, which is what you're creating with your current script.

Here's a gist that shows you the concept without any cruft: https://gist.github.com/darthlukan/0af01...le-mycd-sh

Reference this Stack Overflow answer: https://unix.stackexchange.com/a/156394