Shell Scripting

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.

Two Examples related to shell scripting is attached below: