<oerjan> le/rn tanebvention/Tanebventions include automatic squirrel feeders, necessity, Go, submarine jousting, the universe, weetoflakes, persistence, the BBC, progress, and this sentence. See also tanebventions (math). He never invents anything involving sex.

#!/bin/sh
cd /var/irclogs/_esoteric
if [ "$1" ]; then
    grep -P -i -- "$1" ????-??-??.txt | shuf -n 1
else
    file=$(shuf -en 1 ????-??-??.txt)
    echo "$file:$(shuf -n 1 $file)"
fi