It’s a Docker shebang. Normally shebangs are used to define what shell to use when running a script, or in the case of a python script, to run it with “./myscri

It’s a Docker shebang. Normally shebangs are used to define what shell to use when running a script, or in the case of a python script, to run it with “./myscript” instead of “python myscript.py”. Here OP created a little hack for building and running a docker container by adding a shebang to a Dockerfile. Usually it’s a two step process. You first use “docker build” to build the image and then “docker run” to create a container from it. With this little hack you just run “./Dockerfile” and it does both. It’s cool, but not really useful for most people.