<oerjan> le/rn scowrevs///hackenv/share/scowrevs is a list of repository revision ranges that affected a lot of files but in the end changed nothing (usually because of a revert at the end). Most of our custom repository lookup commands ignore these to reduce noise.

#!/bin/sh
exec perl '-ne/Scheme$/&&push@p,$p;$p=$_}{print$p[rand@p]' ${HACKENV-/hackenv}/share/mtg/allsets.txt