"Could'n get ... using HTML."

You can try it in your private scratchpad:

<p>...your specs/problems...</p>

<p>...what you did...</p>

<c>...some code...</c>

<p>...your question(s)...</p>

<p>... blame/flame stuff etc. and perhaps some regards</p>

This should render like this (less or more):

...your specs/problems...

...what you did... (code unchanged but formatted using Perltidy)

$output =
  `nnmsnmpwalk.ovpl -u system -p manager123 -t 10 -c $String $IP sysNa
+me`;
my $sysName = ( split /\s/, $output ) - 1;
print "system name is $sysName\n";
[download]

...your questions(s)...

... blame/flame stuff etc. and perhaps some regards

See also:

• Writeup Formatting Tips
• Markup in the Monastery
• Perl Monks Approved HTML tags
• How do I work with Scratchpads?

Best regards, Karl