I am trying to execute a simple command on a host. I get output but with a warning.

Use of uninitialized value in concatenation (.) or string at /usr/local/share/perl5/Net/SSH/Perl/Key.pm line 13, <$fh> line 7.

Use of uninitialized value in concatenation (.) or string at /usr/local/share/perl5/Net/SSH/Perl/Key.pm line 13, <$fh> line 8.

Use of uninitialized value in concatenation (.) or string at /usr/local/share/perl5/Net/SSH/Perl/Key.pm line 13, <$fh> line 9.

Use of uninitialized value in concatenation (.) or string at /usr/local/share/perl5/Net/SSH/Perl/Key.pm line 13, <$fh> line 10

here is my code: 
use Net::SSH::Perl;
$username="root";
$passwd="password";
@server = ("10.14.34.80");

my %SSH_Prm = (
            "protocol"         => '2',
            "options"          => ["stricthostkeychecking no"],
        );

foreach $a(@server)
{
  $ssh = Net::SSH::Perl->new($a,%SSH_Prm);
  $ssh->login($username, $passwd);
  $cmd="hostname";
  my($stdout, $stderr,$exit) = $ssh->cmd("$cmd");
  print "$stdout";
}

[download]

In reply to Net SSH Perl warning. by NeerajPandey

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.