Something
public text v1 · immutable#!/bin/bash
rm -f /tmp/fifo1 /tmp/fifo2
mkfifo /tmp/fifo1
equery -q list | egrep '.*/.*' | sort > /tmp/fifo1 &
mkfifo /tmp/fifo2
emerge -pe world | egrep -o '].*$' | awk '{print $2}' | sort > /tmp/fifo2 &
echo "`comm -3 /tmp/fifo1 /tmp/fifo2`"
rm /tmp/fifo1 /tmp/fifo2