May 1st, 2019
Every now and then I’ll move some huge file, a 40GB VM or something and various programs don’t show the space it was in as free. Confusingly some do. df -h shows the wrong free space while “About This Mac” is right.
Apparently, this is a TimeMachine problem!
This command fixed it for me as per the article below.
sudo tmutil thinLocalSnapshots / 10000000000 4
Thanks, Digital Trauma: https://apple.stackexchange.com/a/323455