When a cPanel user exceeds their disk quota, you may want to know where the disk usage is located when determining if the cPanel user's disk quota should be increased or if the user can reduce disk usage.
You can obtain a summary of a cPanel user's disk usage in cPanel >> Files Section >> Disk Usage.
Optionally, you can use the du command in SSH to obtain a summary of a user's disk usage within the user's home directory.
Example: (This will report disk usage under a user's home directory. Disk usage outside of a user's home directory is not included, such as MySQL databases.)
# du -h --max-depth=1 /home/cptest1/| sort -nr