Day 38: Introduction to Scripting

Today I began exploring the foundational skill every DevOps engineer must know — scripting. I focused on Bash scripting, the most widely used shell scripting language in Linux environments.

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🧠 What is Scripting?

Scripting is writing a sequence of commands to automate tasks. In DevOps, scripts are used for:

• Automation

• Configuration

• Monitoring

• Provisioning

• CI/CD workflows

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🐚 What is Bash?

Bash (Bourne Again SHell) is a Unix shell and command language. It's the default shell on many Linux distros and supports:

• Command execution

• Variables

• Conditionals

• Loops

• Functions

• File I/O

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🛠 Today’s Practice:

✅ Basic Script Structure

#!/bin/bash
echo "Hello, DevOps World!"

✅ Variables & User Input

read -p "Enter your name: " name
echo "Welcome, $name"

✅ If Conditions

if [ "$name" == "admin" ]; then
    echo "Access granted"
else
    echo "Access denied"
fi

✅ Loops

for i in {1..5}; do
    echo "Iteration $i"
done

✅ Functions

greet() {
    echo "Hello from a function"
}
greet

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🔍 Why Bash Scripting in DevOps?

• Automates server provisioning

• Supports CI/CD pipelines

• Useful in Docker, Ansible, Kubernetes

• Great for cron jobs and backups

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📚 What I’ll Explore Next:

• More in variables System variables

• Shell script best practices

• Commad line arguments