The 1brc shell script uses `#!/bin/bash` instead of `#!/usr/bin/env bash`. Using `#!/usr/bin/env bash` is the only safe way to pick up a `bash` that’s in your $

The 1brc shell script uses `#!/bin/bash` instead of `#!/usr/bin/env bash`. Using `#!/usr/bin/env bash` is the only safe way to pick up a `bash` that’s in your $PATH before `/usr/bin`. (You could do `#! bash`, but that way lies madness.)