Re: PEBCAK
"It happened on Synology NAS, which run busybox (a special version of Linux for low power CPU/RAM)"
There seems to be an implication here that busybody is a version of Linux. It isn't. It's an all-in-one replacement for many of the normal Unix-style command line utilities for low resource situations where low resource includes running out of small flash storage. It requires a kernel which is a separate entity.