Shebang

External

• https://en.wikipedia.org/wiki/Shebang_(Unix)#:~:text=In%20computing%2C%20a%20shebang%20is,bang%2C%20or%20hash%2Dpling.
• https://tldp.org/LDP/abs/html/sha-bang.html

Internal

• bash
• env

Overview

The #! sequence of characters at the beginning of a file indicates that the file is a script: a set of commands to be fed into an interpreter. The path that follows #! is the path to the program that interprets the commands in the script, whether it be a shell, a programming language, or a utility. The interpreter executes the commands in the script, starting with the line following the #! line:

#! <interpreter> [optional-args]

Bash

#!/usr/bin/env bash
echo "."