Need help with finding files that are taking up disk space

[GoWithGusto]

So I have this problem with my System Files. They take up 102GB of storage space on my flash storage. In the screenshot, it is the grey bar on the storage management window. I've checked the Library folder and the Users folder. They hold 9GB & 5 GB, hardly gets me up to 121GB. I've looked a bit into how Time Machine works on the Apple Forums and it sounds like it takes a local snapshot and deletes the oldest one as the disk fills up. I'm not putting my money there.

On a different thread in this forum, I learned about the Shift+CMD+G tool to find folders. Also the CMD+I function to find out how much storage a folder takes up. I just don't know what else to check to find out what's eating up all my storage.

Does anyone have any ideas?
Thanks in advance.

Edit: MacOS 10.14.5

 

[ghanwani]

You could try the following:

Open a terminal window, and then type

$ cd /
$ du -k . 2> /dev/null | sort -rn | more

The command may take a few seconds or even tens of seconds before you see output.

This will show you a sorted list of folders and files in descending order of storage in KB. The base folder will include the size of all of its components, and then all of the components get listed with their sizes.

It's pretty accurate on my machine, but if that is not insightful for your machine, we might need to modify the command to handle hidden files, but I'd have to look into that.