It wasn’t on Linux on but on a Vax Unix machine in the early 90s. We were an IBM shop but the accounts department got a Vax to run their new software. Obviously we were expected to look after this little box with no training. Things went quite well until it started to to run out of space. I found a huge file called vmuniz iirc and couldn’t see anything using using it. The file was deleted and the job was done. Until we rebooted.