which(1) on OpenBSD

The text 4d82c8d3e72c, as OpenBSD 3.3, OpenBSD 3.2, OpenBSD 3.1, OpenBSD 3.0, OpenBSD 2.9, OpenBSD 2.8, OpenBSD 2.7 shipped it.

locate a program file (or files) in the path

Flags it lists