Welcome to Day 18 of my 100 Days of DevOps journey!

Today was a Review + Lab Day, where I practiced everything I’ve learned so far about Git, Bash scripting, and Linux administration — all essential for upcoming projects.

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🎯 Goals

• Reinforce Git basics, Bash scripting, and Linux commands

• Complete mini-labs for each topic

• Prepare for automation project (Day 19)

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🧠 Topics Reviewed

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🧪 Lab Exercises

✅ Linux Lab

# File operations
mkdir lab_dir && cd lab_dir
touch file1.txt && chmod 640 file1.txt

User management

sudo adduser devuser
sudo passwd devuser
sudo usermod -aG sudo devuser

Logs

sudo tail -n 50 /var/log/syslog
journalctl -xe

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✅ Git Lab

Init and commit

mkdir git-lab && cd git-lab
git init
echo "# Git Lab" > README.md
git add . && git commit -m "Initial commit"

Branching and merging

git checkout -b dev
echo "New line" >> README.md
git add . && git commit -m "Dev update"
git checkout main
git merge dev

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✅ Bash Lab

Basic script

echo -e '#!/bin/bash\necho "Hello, $USER. Today is $(date)."' > hello.sh
chmod +x hello.sh
./hello.sh

Logic script

cat <<EOF > check_even.sh
#!/bin/bash
read -p "Enter a number: " num
if (( num % 2 == 0 )); then
  echo "\$num is even"
else
  echo "\$num is odd"
fi
EOF
chmod +x check_even.sh
./check_even.sh

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###🎯 Bonus Challenge

Build a script that:

• Initializes a Git repo

• Creates a branch

• Adds a file and commits

• Pushes it (for Day 19 foundation)

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###✅ Summary

✅ Reviewed Linux, Git, Bash ✅ Completed 7+ real-world lab tasks ✅ Ready for Day 19’s automation project!

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GitHub Journal 📝 Hashnode Blog

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💬 Let’s Connect!

💬 Drop your feedback or suggestions here or on LinkedIn. Let’s grow together! #100DaysOfDevOps #Bash #GitHubCLI #DevOpsTools # github