Why do you think the prof even used bash? I highly doubt his ancient SunOS machine had a GNU toolchain. `test` and `[` are both POSIX, but if there was no `/bin/[` I doubt the shell in question (original Bourne? Some proprietary Sun shell? Who knows) had it built in either.

Bourne /bin/sh I’m certain of it. If it was Sun OS, it was sh. Was just stating that he was sitting on old while trying to teach new and handing out -1’s for leveraging the new.

Terrible…