which(1) on OpenBSD

The text 3fa7fc09be1e, as OpenBSD 4.1, OpenBSD 4.0, OpenBSD 3.9, OpenBSD 3.8, OpenBSD 3.7, OpenBSD 3.6, OpenBSD 3.5, OpenBSD 3.4 shipped it.

locate a program file (or files) in the path

Flags it lists