lfcs practice
LFCS style performance drills.
LFCS-style study rewards hands-on command fluency. These cards are written around tasks you can rehearse in a disposable shell before touching production.
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Practice areas
- Essential commands for files, text, archives, permissions, and processes.
- Operations and deployment checks such as services, logs, restarts, and release pointers.
- Storage checks for disk usage, mounts, filesystems, and backups.
- Networking checks for DNS, ports, HTTP, firewalls, and service reachability.
- Users, groups, access review, SSH, and security hygiene.
How to practice
Read the scenario, try to solve it without copying first, then use the command card to compare flags, output, and safety notes.
Performance practice map
Use these as task-style drills: identify the condition, run the safest inspection command first, and explain what the output means.
- Search logs for failures, then use journalctl since boot for service-specific context.
- Find large files, check inode pressure, and inspect tar archives for storage practice.
- Preview rsync behavior before backup or sync changes.
- Compare DNS resolvers, check listening ports, and review firewall status for networking drills.
- List login-shell accounts, review sudo grants, and inventory SSH authorized keys for users and access review.