df
Reading the systemPackage: coreutils
The space on each filesystem, in blocks or with -i in inodes. A "full" disk while df -h shows room is almost always a df -i at 100%.
What its options do in the lessons
From the same glossary the lessons render under their commands, so the two cannot disagree.
df -h- Human-readable sizes (
4.3Ginstead of4508876). df -i- Counts *inodes* rather than bytes. A disk can run out of inodes while still reporting free space.
df --output- Chooses which columns to print instead of the full table. Useful in a script.
Lessons that teach it
- What a server actually isYour first server
- What the panel limits, and what its backups do not coverISPConfig: hosting several sites on one server
- The redirection empties the file firstBash scripting for administrators
- Disk, memory and load: reading them correctlyMonitoring a server
- An automated check that is worth havingMonitoring a server
- What an output proves, and what "success" does notDiagnosing a failure: what each output proves
- From a symptom to one component: what the hypothesis forbidsDiagnosing a failure: what each output proves
- Capture before you repair: the state a fix deletesDiagnosing a failure: what each output proves
- pg_wal fills, and something is holding itAdministering PostgreSQL: access, connections and growth