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Chapter 21: Bash Scripting Essentials

In this chapter, we transition from being simple terminal users to System Architects. We will learn how to automate repetitive tasks using Bash Scripting in our Termux-Debian environment.

1. The Anatomy of a Bash Script

Every script must start with a Shebang. This tells the system which interpreter to use to execute the code.

#!/bin/bash
# This is a comment - it is not executed

2. Creating Your First Automation Script

Let's build a System Maintenance Script that updates the system and cleans up unnecessary files in one go.

Create the file: nano maintenance.sh

#!/bin/bash

echo ">>> Starting System Maintenance..."

# Update and Upgrade
sudo apt update && sudo apt upgrade -y

# Clean up
sudo apt autoremove -y
sudo apt autoclean

echo ">>> Maintenance Complete! Matrix is optimized."
    

3. Permissions and Execution

By default, a new file is not executable. You need to modify its mode using chmod:

chmod +x maintenance.sh

Now you can run it using: ./maintenance.sh

4. Variables and Logic

Automation becomes powerful when we use variables. This allows us to handle dynamic data like dates and file paths.

#!/bin/bash
USER_NAME="Architect_Loy"
CURRENT_DATE=$(date)

echo "Hello $USER_NAME, the current system time is $CURRENT_DATE"
    

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