small comment: there is no "&" in front of WNOHANG.

Because you removed it! :) 

$ perl -Mstrict -Mwarnings -e " print WNOHANG "
Name "main::WNOHANG" used only once: possible typo at -e line 1.
print() on unopened filehandle WNOHANG at -e line 1.

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In reply to Re^3: Using IO::CaptureOutput in a child process to caputre STDOUT and STDERR by Anonymous Monk
in thread Using IO::CaptureOutput in a child process to caputre STDOUT and STDERR by clintonm9

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