<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

'Collatz problem calculator
'Programmed by Jannis Harder (jix), 2005
1[1?,1~10:2,0>-1,2=*0,2>-2,0+*2,0+*1,0-48]1
2[0#,5=10,5$,0~1:0,1=*0,1|1,1<-1:3,0>1]2
3[1=*0,0+*1,0+*1,0+1]2