'2>&1 |' is valid in CMD.exe.

But the demonstrated pipe | should rather already be Perl syntax from open

edit

see https://perldoc.perl.org/functions/open#Opening-a-filehandle-into-a-command

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^3: Problems using Tk::ExecuteCommand on windows (win32 win64) by LanX
in thread Problems using Tk::ExecuteCommand by marbu

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