#!/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