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use warnings;
use strict;
...
  print "child believes it is: $$\n";
  exec( $cmd ) # replaces child with a new perl: pid shouldn't change,
+ right?
}

   parent: pre-fork id 27516
   child believes it is: 27517
...
   parent: still here, with id 27516
   parent: sees processes...
   27516 pts/1    R+     0:00 /usr/bin/perl /home/doom/bin/testes-fork
+itude

   parent: pre-fork id 7253
   child believes it is: 7254
...
   parent: sees processes...
   7253 pts/3    S+     0:00 /usr/bin/perl /home/doom/bin/testes-forki
+tude
   7254 pts/3    Z+     0:00 [perl] <defunct>