gistfile1.txt

setpgid(0,0);                                                  
exec("${command}");                                            
# I think the below comment is a little bit full of lies       
#                                                              
# we need to do this because somehow sml manages to            
# fork a second internal process that ignores direct           
# kills of the child.  instead we create a new process         
# group and then send an INT process to the direct child       
# which then passes a KILL onto every process in its new group.
die "exec failed";