Terminal

Everything here is simulated in your browser, so you cannot break anything. Complete the missions to learn the essential commands.

learner@pandadev: ~

Missions

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Who am I? Find out which user you are logged in as: whoami Submit for review
Find your way Move into the projects folder and print where you are: cd projects, then pwd Submit for review
Make folders Create nested folders in one go: mkdir -p ~/notes/2026 Submit for review
Write a file Save a to-do: echo "learn linux" > ~/notes/todo.txt Submit for review
Read a file Show the welcome note: cat ~/readme.txt Submit for review
Copy and move cp ~/readme.txt ~/notes/readme.bak, then mv it into ~/notes/2026/ Submit for review
Search a log Find the errors: grep -i error ~/logs/server.log Submit for review
Chain commands Count error lines with a pipe: cat ~/logs/server.log | grep ERROR | wc -l Submit for review
Make it executable Give the deploy script execute permission: chmod +x ~/scripts/deploy.sh Submit for review
Clean up Delete the tmp folder and everything in it: rm -r ~/tmp Submit for review
First commit git init, then git add readme.txt, then git commit -m "first commit" Submit for review
Stop a stuck process List processes with ps, then stop the stuck job: kill 777 Submit for review
Read the logs Show the last lines of logs/server.log: tail -n 5 logs/server.log Submit for review
Find files Search for files by name: find . -name "*.txt" Submit for review
Count lines Count the lines in a file: wc -l logs/server.log Submit for review
Sort and de-duplicate Pipe a file through sort and uniq: cat logs/server.log | sort | uniq Submit for review
Set a variable Create an environment variable: export APP_ENV=production Submit for review
Append to a file Add a second line to notes/todo.txt: echo "ship it" >> notes/todo.txt Submit for review
Check the system See disk and memory use: df -h (or free -h) Submit for review
Build a history Make two git commits, then read them with git log Submit for review

Tips: press Tab to complete names, Up and Down for history, and type man followed by a command for help.

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