Or perhaps instead work with IPC::Run3 and let it handle all that nastiness internally: 

use IPC::Run3;   

run3 \@cmd, \$in, \$out, \$err;

[download]

-xdg

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In reply to Re^2: catching STDERR of a system(@callout) by xdg
in thread catching STDERR of a system(@callout) by agarsha

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