• You have learned in the previous section that UNIX shells can take commands from a file also. Such files are called shell scripts.

• In this section we will explore how to write your own shell scripts. We will discuss only those things which will be required to successfully complete upcoming eYRC Tasks.

Shebang (UNIX)

• In UNIX, shebang is a line which is added at the beginning of any script that you want to run as a standalone executable.

• The line should starts with #!.

• A shebang tells the shell which interpreter to use and its location in order to execute the script. For example,

  • If I write a script for Bash Shell then I would have to include the following at the beginning of the script.

    #!/bin/bash
    

  • If I write a script for Python then I would have to include the following at the beginning of the script.

    #!/usr/bin/env python3
    

• A shebang gives the script the ability to be executed as an executable.