Loops & Conditions – Making Scripts Think Like a Ninja!

A true ninja 🥷 is unpredictable, strategic, and adaptable – just like your scripts should be! With if statements, loops, and case conditions, your shell scripts will think, decide, and repeat like a true cyber warrior! ⚔️

If Statements – The Ninja’s Decision-Making

A ninja chooses their path wisely. In scripting, we use if statements to make decisions.

Example: Checking if the user is a true ninja!

#!/bin/bash

echo "Enter your ninja rank (master/apprentice):"
read rank

if [ "$rank" == "master" ]; then
    echo "🥷 Welcome, Master Ninja! The shadows bow before you!"
elif [ "$rank" == "apprentice" ]; then
    echo "👶 Keep training, young warrior! Your time will come!"
else
    echo "❌ Unknown rank. Are you even a ninja?!"
fi

💡 The if statement is like a ninja choosing whether to strike or stay hidden. 🎭

Loops – Repeating Tasks Like a True Warrior

Ninjas train every day. Your scripts should too! Loops let you repeat tasks automatically.

Example: Training a ninja 5 times using a for loop

#!/bin/bash

for i in {1..5}; do
    echo "🥷 Ninja training day $i: Practice your stealth!"
done

🌀 Types of Loops in Shell Scripting:

Loop Type	Purpose
for	Repeats a task a set number of times
while	Repeats as long as a condition is true
until	Repeats until a condition becomes true

Case Statements – Choosing the Right Path

A wise ninja doesn’t always follow one path. The case statement is like a decision tree for your scripts. 🌳

Example: Choosing a ninja weapon

#!/bin/bash

echo "Choose your weapon (katana/shuriken/nunchucks):"
read weapon

case $weapon in
    katana)
        echo "⚔️ A fine choice! The katana is a weapon of precision."
        ;;
    shuriken)
        echo "🎯 Ah! The art of ranged combat."
        ;;
    nunchucks)
        echo "🔥 Bruce Lee would be proud!"
        ;;
    *)
        echo "❌ That’s not a ninja weapon!"
        ;;
esac

💡 case statements make your script more readable and elegant – like a ninja’s movements! 🏯

Ninja Training Challenge

✅ Modify the ninja rank script to give a custom greeting for 'Sensei'

✅ Create a loop that asks for a secret password and exits only when it’s correct

✅ Make a case statement that responds to different Linux commands entered by the user