Windows can also do 2>&1 like bash. So how about like this? 
$pm->start($cmds[$child] . " > /tmp/$$.$child.log 2>&1")

[download]
$child may be unique through commands. And collect the outputs afterwards?

In reply to Re^3: capture stdout and stderr from external command by remiah
in thread capture stdout and stderr from external command by pankajadvani

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