⚔️ Day 26 Linux Challenge: grep, find, head, tail & wc Edition

Welcome back to Day 26 of my #100DaysOfLinux challenge!
Today, you're not just reading — you're playing along 🎮.

We’re diving deep into essential Linux CLI tools:

• grep
• find
• head / tail
• wc

Ready? Let’s go 💪

📚 Table of Contents

• 🔧 Step 1: Create Your Sample File
• 🚨 Challenge 1: grep Games
• 🕵️‍♀️ Challenge 2: Find It Like a Pro
• 📜 Challenge 3: Head & Tail of the Story
• 🧪 Challenge 4: Count Me In (wc)
• 🤖 Bonus Challenge: Find the Unmatched Lines
• 🏆 Your Turn!

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🔧 Step 1: Create Your Sample File

Before we jump into the challenges, let’s create a simple file with mixed log lines:

This file (file.txt) will be our playground today.Then check with cat file.txt.

🎯 The Tools & Commands You’ll Use

Before the challenge, here's your weapon list:

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🚨 Challenge 1: grep Games

🎯 Task:

1. Find all lines that start with "ERROR".
2. Find lines that end with "completed".
3. Ignore case and search for "warning".
4. Show lines that do not contain "INFO".
5. Count how many times "404" appears.

💡 Hints:

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🕵️‍♀️ Challenge 2: Find It Like a Pro

🎯 Task:

1. Find all .log files in /var/log.
2. Find all .sh files modified in the last 2 days.
3. Find all empty .txt files.

💡 Hints:

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📜 Challenge 3: Head & Tail of the Story

🎯 Task:

1. Show the first 5 lines of a file.
2. Show the last 15 lines.
3. Watch a log file update live.

💡 Hints:

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🧪 Challenge 4: Count Me In (wc)

🎯 Task:

1. Count number of lines in a file.
2. Count total words.
3. Get line + word + byte count together.

💡 Hints:

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🤖 Bonus Challenge: Find the Unmatched Lines

🎯 Task:

You have two config files: config.old and config.new.
Find which lines are in config.old but not in config.new.

💡 Hint:

grep -v -F -x -f config.new config.old

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🏆 Your Turn!

Pick any 3 challenges above and try them out in your terminal.

Then come back and drop a comment:

• ✅ Which one did you complete?
• 🚤 Which one was hard?
• 🚀 Which one was fun?

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