So your hard drive is getting kind of full. Or more space is being
used and you want to know where it all is. The disk usage command, du,
provides a great way to find out where your rig’s fat lies. I normally
start at the root of the chubby volume, like so

sudo du -ch -d 1 /

And enter your admin password when prompted. Depending on a number of
factors this can take some time. As long as nothing is terribly out of
whack the bulk of the GBs will be in /Users. Then just update the path
to probe inside your user folder until you find the unhealthy fat
stores.

sudo du -ch -d 1 /Users/fakemacfusion/