Try this. It prompts for a password. It returns true if correct or "Permission denied" if incorrect.
#!/usr/bin/perl
use strict;
no warnings;
use Expect;
use Net::OpenSSH;
select STDOUT;
$| = 1;
select STDERR;
$| = 1;
my $username = 'root';
my $password = $ARGV;
my $ip = 'localhost';
my $timeout = 10;
my $debug = 0;
my $ssh = Net::OpenSSH->new( "$username\@$ip",
strict_mode => 0 );
my ( $pty, $pid ) = $ssh->open2pty("show ip arp")
or die "unable to run remote command show ip arp";
my $expect = Expect->init($pty);
$expect->raw_pty(1);
$debug and $expect->log_user(1);
$debug and print "waiting for password prompt\n";
$expect->expect( $timeout, ":" )
or die "expect failed, $expect->exp_error()\n";
$expect->send("$password\n");
while (<$pty>) {
print "$. $_";
}
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