Shebang

#!/bin/sh
Before you add anything else to your script, you need to alert the system that a shell script is being started. This is done using the shebang construct.

Source: tutorialspoint.com

Shebang unix

#!/bin/bash
OR

#!/usr/bin/perl
OR

#!/usr/bin/python
OR

#!/usr/bin/python3
OR

#!/usr/bin/env bash

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