According to the index of documented Unix facilities [1] it first appeared in 2 BSD [2].
[1]
https://dspinellis.github.io/unix-history-man/man1.html
[2]
https://dspinellis.github.io/manview/?src=https%3A%2F%2Fraw.githubuserconte…
24 Apr 2022 18:29:14 ron minnich <rminnich(a)gmail.com>:
can someone point me at the earliest version of
whereis? I first saw
it in 4.1, but maybe it came sooner. Also, if you've got a link to man
pages, thanks in advance.
I'm trying but failing to find it. My daughter says I suck at web
search, which, given where I work, is a bid sad :-)