Here is how to get a user’s disk space usage on a cPanel user:
WHM
You can see the usage on the left-hand side of cPanel, or in the ‘List Accounts’ view of WHM:
du:
du -h /home/$userQuota cache:
egrep "^${user} " /var/cpanel/repquota.cacheActual quota:
quota -v | egrep "^${user} "cPanel datastore:
cat /home/$user/.cpanel/datastore/_usr_bin_quota_-v