<oerjan> le/rn bimonthly//The word "bimonthly" has at least two meanings, although this wisdom only gives about half of one. No matter which expert you follow, you\'re 50% likely to misinterpret it, or doubly so, depending on the phase of the moon.

#!/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