How to run a shell script on a Unix console or Mac terminal?

Question

I know it, forget it and relearn it again. Time to write it down.

Answer 1

Little addition, to run an interpreter from the same folder, still using #!hashbang in scripts.

As example a php7.2 executable copied from /usr/bin is in a folder along a hello script.

#!./php7.2

To run it:

./hello

Which behave just as equal as:

./php7.2 hello

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The proper solutions with good documentation can be the tools linuxdeploy and/or appimage, this is using this method under the hood.