open2 only captures output from the controlled programs stdout; the error message is being output to its stderr.
Try: my $command = 'plink -ssh -pw password_here username_here@host_name_here -batch exit 2>&1';
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.