Probably correct. Unfortunately I have no idea how mycmd might be analyzing its parent process. To my knowledge no relevant environment variables are set either from the shell or from Perl. Mycmd is closed source, so I'm likely at a dead end.

How can I check that Perl isn't setting any environment variables?

In reply to Re^2: Perl ignores lines with bold characters from a pipe on Windows (source not dest) by kingkongrevenge
in thread Perl ignores lines with bold characters from a pipe on Windows by kingkongrevenge

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