interesting...I agree with you (see my last reply to Corion), but when I run your second script I get this (no fooling): 
perl -e '
   open my $fh, q{perl -e '\''sleep 1; print STDERR "C"'\'' |};
   print "P";
'
CP

[download]
(I couldn't use 'say', you must have a later version of perl than I?)

In reply to Re^6: how to kill background process when script exit? by Allasso
in thread how to kill background process when script exit? by Allasso

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