kpsewhere(1) on Linux
The text 82f147dbd59f, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
Expanding kpsewhich to separately iterate over each texmf tree listed in $TEXMF.