Set log_stdout AFTER the spawn worked for me (it did not work if it was set before the spawn):

$exp->spawn("su - root");
$exp->log_stdout(0);  ## <<AFTER the spawn

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Apologies for answering an oldie, but it helped me.

In reply to Re: Expect prints command to console by Anonymous Monk
in thread Expect prints command to console by daphnaw

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