Every few days, I had an issue where my startup disk was full and emptying the trash just wasn’t doing enough.
I found the following command online that searches a file system for files over 500MB and prints the file path. It identified files I had totally forgotten about as well as some huge files generated by apps I no longer used.
sudo find / -size +500000 -print
I then used the rm command to delete files. When deleting entire directories I used the recursive flag (be careful!)
rm -rf <directory path>
Kudos to davidcraddock.net
magp.ie 