It had a bash shell, and used glibc, and partially implemented POSIX.

I was also able to get most my CS homework done in BeOS. But I definitely needed to keep FreeBSD around for when I hit a wall.

It was ok. Back when I ran BeOS as my primary OS (2001 or so) I built half a C++ web application on BeOS, the other half on a HP-UX server logged in through an X terminal using ftp to sync between the two. Not much support in the wider *nix ecosystem though, so anything big would often fail to build.

I regretted having to move away from BeOS, it was by far the most pleasant OS I’ve used, but the lack of hardware and software support killed it.

In college I wrote a web server in beos and ported it back to Linux, learning pthreads along the way. Bonus achievement was making it multithreaded, so I got that for free, since beos makes you think architecturally as multithreaded first

AmigaOS was not UNIX-like in the least. Amiga UNIX, which shipped on a couple models, was directly System V UNIX, though.

That was the point I was trying to convey regarding BeOS.

Having a shell that looks like UNIX, and a couple of command line utilities similar to the UNIX ones, does not make an OS UNIX.

Ah. I gotcha now.