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Disk and Storage Commands
Disk and Storage Commands df -h shows free disk space. du -h shows how big folders are. Find big folders: du -h --max-depth=1 | sort -h When the disk is 100% full , MySQL and Nginx give strange errors. People search their code for hours. Always check df -h first. A full disk can stop logs from being

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What it is
df -h shows free disk space. du -h shows how big folders are.
Example
Find big folders: du -h --max-depth=1 | sort -h
Common mistake
When the disk is 100% full, MySQL and Nginx give strange errors. People search their code for hours.
Always check df -h first.
Security link
A full disk can stop logs from being written. Then attacks leave no trace.
Learn more in the lesson: 6.8 Disk and Storage Commands