Command-line challenges

32 short tasks to solve in a terminal simulator right in your browser, from your first folder to Claude Code commands. Solved: 0 of 32.

• Working folderEasy+10 XP
• A quick noteEasy+10 XP
• Who am I, where am IEasy+10 XP
• Project treeEasy+15 XP
• Site structureMedium+20 XP
• Tidy upMedium+20 XP
• Find the error in the logMedium+20 XP
• How many lines?Medium+15 XP
• No duplicatesHard+25 XP
• The full cycleHard+30 XP
• Your first commitMedium+25 XP
• Only the file you needHard+30 XP
• Find it by nameMedium+20 XP
• How many errors?Hard+25 XP
• Run a programEasy+10 XP
• Append to a logMedium+15 XP
• An environment variableMedium+15 XP
• Start and end of a fileMedium+15 XP
• Make a backupEasy+10 XP
• Make a script executableMedium+15 XP
• Build the projectMedium+15 XP
• A three-command pipelineHard+25 XP
• The smallest numberMedium+15 XP
• Your first API requestClaude CodeEasy+15 XP
• A request with a system promptClaude CodeMedium+20 XP
• Pick the Haiku modelClaude CodeMedium+20 XP
• Connect an MCP serverClaude CodeEasy+15 XP
• A remote server over HTTPClaude CodeMedium+20 XP
• Connect it, then disconnect itClaude CodeMedium+20 XP
• The scout subagentClaude CodeEasy+15 XP
• The orchestration planClaude CodeMedium+20 XP
• Skill scaffoldClaude CodeMedium+20 XP

New to the terminal? Start with the free Terminal Basics course. Every command used here is explained in the command cheat sheet, and the terminal simulator lets you practise with no task at all.