Thanks for reply , I am able to run command as nagios and its returning right value 120 to me ---------------------------------------------------------------------------------------------------------- [nagios@monitor ~]$ /usr/bin/sudo /sbin/iptables -vL|/bin/grep ':ssh'|/bin/awk '{print $1}' 120 ---------------------- <div class="gmail_quote">On Fri, Jul 20, 2012 at 5:33 PM, Voigt, Thomas <<a href="mailto:Thomas.Voigt@netkom.de" target="_blank">Thomas.Voigt@netkom.de</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, is your nagios user allowed to run the sudo command from the first line in your script? Please login as <your nagios user> and execute the command <div class="im"> /usr/bin/sudo /sbin/iptables -vL|/bin/grep ':ssh'|/bin/awk '{print $1}' </div>directly. Do you see any output? -- Regards Thomas Voigt <div class="HOEnZb"><div class="h5"> ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. <a href="http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/" target="_blank">http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/</a> _______________________________________________ Nagios-users mailing list <a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </div></div></blockquote></div> -- <a href="http://linuxmantra.com">http://linuxmantra.com</a>