场景练习
在浏览器中直接体验即开即用的免费在线 Linux 终端。练习 Ubuntu bash 命令，探索虚拟文件系统，完成互动教程。
Easy100 pts
Challenge 1: Find the Secret Flag File
Locate a hidden system configuration file inside the /etc/ directory tree and output its configuration values.
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Medium250 pts
Challenge 2: Fix Restricted Log File Permissions
The auth log file has restricted permissions. Update its permissions to 755 using chmod so processes can inspect it.
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Hard500 pts
Challenge 3: Extract IP Addresses with Grep
Parse system authentication logs and extract failed login attempts matching IP address patterns using grep regex.
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Easy200 pts
Challenge 4: Clean Up Temporary Workspace Logs
The temporary /tmp filesystem needs maintenance. Safely inspect and clean up old diagnostic log files.
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Medium300 pts
Challenge 5: Diagnose System Resource Metrics
A simulated resource spike occurred. Use process monitoring tools like ps aux and top to identify active tasks.
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Hard400 pts
Challenge 6: Create Compressed Backup Tarball
Bundle the entire /home/user/projects directory into a compressed tarball named projects_backup.tar.gz.
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