whether a script is executable or not is confusing due to inconstencies in file naming, permission setting, inclusion of hashbangs or not in the top line, and similar. We need to regularise this to make comprehension easier.

Related: parse-proxy-url.sh is not a script (not +x , doesn't do something useful if you execute it) but it is sourced and runs active code  which is very unusual and should be similarly regularised.