<oerjan> le/rn speedy gonzales/Sp e e d y G o n z a l e s i s t h e f a s t e s t m o

#!/bin/sh
find /var/irclogs/_esoteric -mindepth 1 -maxdepth 1 -type f -name '????-??-??.txt' | sort -r | xargs -d'\n' -r tac -- | grep "^..:..:..: <$1>" | head -n 1