I'd add, in each my Bash scripts I add this line to get the script's current directory:

SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )

This is based on this SA's answer: https://stackoverflow.com/questions/59895/how-do-i-get-the-d...

I never got why Bash doesn't have a reliable "this file's path" feature and why people always take the current working directory for granted!