That is because all of the $f_stdout values derived from the same SSH connection are the same handle

No, they are not. Every open3 call opens a new channel and returns a different set of pipes attached to the remote process stdin, stdout and stderr streams.

In reply to Re^2: net::OpenSSH several commands, stdout are mixed up by salva
in thread net::OpenSSH several commands, stdout are mixed up by Bolemo

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