<Jafet> (echo \'#!/bin/sh\'; echo \'a() { p=$(echo -n $(ps -p $0 -oppid | tail -1)); if egrep " \\| cat\\$" /proc/$p/cmdline; then ps -p $0 -ocmd | tail -1; else a $p; fi }\'; echo \'a $$\') > bin/quine2

#!/bin/bash
cd interps
make >& /dev/null &
sleep 20
kill %
wait
echo $?