Disk Usage Skill

Use this skill to analyze disk space and filesystem usage on Linux systems.

Quick Start

Run the included script for a disk usage overview:

./scripts/diskinfo.sh

Manual Commands

Filesystem Overview

• df -h – Disk space usage for all mounted filesystems (human-readable)
• df -i – Inode usage (number of files)
• lsblk – Block device tree (disks, partitions)
• mount – Currently mounted filesystems

Directory Size Analysis

• du -sh /path – Total size of a directory
• du -h --max-depth=1 /path – Size of immediate subdirectories
• du -ah /path | sort -rh | head -20 – Largest files/directories

Finding Large Files

• find /path -type f -size +100M – Files larger than 100MB
• find /path -type f -size +1G – Files larger than 1GB
• ls -lhS /path | head -20 – List files sorted by size (largest first)

Disk Information

• cat /proc/partitions – Partition table
• cat /proc/mounts – Mount information
• stat -f /path – Filesystem statistics

Tips

• Always use -h for human-readable sizes
• The du command can be slow on large directories
• Use --max-depth=1 to limit recursion depth
• Root filesystem (/) usage above 90% may cause issues