What am I doing wrong?

I am trying to enter the password scp promts for via pump(): 

my @scp = ("scp", "long command line...")
my $h = start(\@scp, \$in, \$out);
$in = "mypassword\n";
pump $h if $out =~ /password/i;

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In reply to IPC::Run and scp's password entry by isync

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