[kwlug-disc] Why I Don't Use #!/bin/bash - Shebangs Explained! (Another one by Dave at YSAP)

[Ron]

It's a long weekend, a good time to play in the garden, ride bicycles up 
and down hills, and watch some `bash` videos.


Dave at YSAP discusses "shebang" lines and does his deep-dive into them.


Shebang lines are those lines at the top of a script that bash 
processes, right?

Wrong. Bash ignores that line, it's the kernel that processes the shebang.

Node / v8 also are smart enough to ignore the shebang line, even though 
lines starting with # in JS are *not* comments.  Cool!



He compares behaviours on Darwin, Void Linux, and IllumOS / SunOS.

Differences show up when passing options in shebang lines.



Lots of interesting tricks can be had by tweaking that line, and after 
some 10 minutes of general explanation, he heads down the rabbit hole 
starting with his favourite distro, Void Linux.


> https://www.youtube.com/watch?v=aoHMiCzqCNw


TL;DR:

use:

#!/usr/bin/env bash

(or, since I'm a new convert)

#!/usr/bin/env fish