sed '' << 'EOF'
http://thread.gmane.org/gmane.comp.shells.dash/73
Let's listen to silence again now...

Update:
`set -F[rnd:$(read_ethernet_now)]` -- another choice
( # if there's no that much network activity:
wget ftp://ftp.kernel.org/another_kernel.tar.bz2 &
sleep "$seed"
set -F[rnd:$(read_ethernet_now)]
kill $!)
EOF