Syntax

• Use /bin/bash as the bash interpreter:

#!/bin/bash

• Search the bash interpreter in the PATH environment variable with envexecutable:

#!/usr/bin/env bash

Remarks

A common mistake is to try to execute Windows end-line formatted \\r\\n script files on UNIX/Linux systems, in this case the used script interpreter in the shebang is:

/bin/bash\\r

And is obliviously not found but can be hard to figure out.