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7.5Quick Reference: Essential Commands
| Task | Command |
|---|---|
| Find a file | find / -name "playwright.config.ts" 2>/dev/null |
| Disk usage | df -h |
| Memory usage | free -h |
| Watch a command repeatedly | watch -n 5 "curl -s localhost:3000/health" |
| Compare two files | diff expected.json actual.json |
| Compare directories | diff -r dir1/ dir2/ |
| Check DNS | nslookup staging.example.com |
| Open network ports | ss -tlnp |
| Download a file | wget https://example.com/file.zip |
| Create an archive | tar -czf backup.tar.gz test-results/ |
| Extract an archive | tar -xzf backup.tar.gz |
| Check file encoding | file document.txt |
| Count lines in files | wc -l *.spec.ts |