This article contains the strangest word I ever heard in programming land: Shebang. A Shebang is a character sequence containing the two characters
#! and is used on Unix-like operating systems. When a text file starts with
#!, it is considered a script and the program loader parses the rest of that line to check what interpreter should be used to execute the script.
Here is an example:
#!/bin/sh echo Ommadawn
The first line has the shebang, followed by the path to the interpreter, in this case the system shell. In other words, every line in this script after the first line will be executed with the system shell.
ommadawn(no extension needed)
./ommadawn zsh: permission denied: ./ommadawn
chmod +x ./ommadawn
You can use the same strategy to make Python files executable without having to type
python in front of the file. Do make a Python script executable, save the following script as
#!/usr/bin/env python3 print("Ommadawn")
The path to the python interpreter depends on your system. Linux and macos both have Python 2 installed. If you installed Python 3 manually, things can get quite confusing.
#!/usr/bin/env python3 works on macos.
chmod +x ./test.py
Making scripts executable, is a security risk. If the code in an executable script is changed by accident or with bad intentions, disasters can happen on your machine. Think carefully before making a script executable!