<Taneb> learn Go is a programming language invented by Google, a game invented in East Asia, and a common verb in the English language, invented by Germanic tribes. Taneb invented all three.

#!/bin/sh
allquotes | if [ "$1" ]; then
    if expr "$1" + 0 >/dev/null 2>&1; then
        sed "$1q;d"
    else
        grep -P -i -- "$1"
    fi
else shuf -n 1; fi