On 30 Sep 2013 15:32, "Kaushal Shriyan" <<a href="mailto:kaushalshriyan@gmail.com">kaushalshriyan@gmail.com</a>> wrote: > > Hi, > > As per the url > > <a href="http://exchange.nagios.org/directory/Plugins/Uncategorized/Operating-Systems/Linux/CheckDirSize/details">http://exchange.nagios.org/directory/Plugins/Uncategorized/Operating-Systems/Linux/CheckDirSize/details</a> > > Please help me understand about -f flag which says perfdata "CheckDirSize now generates perfdata if desired (option -f)" . Not sure i understand about perfdata. Is there a way to measure performance? See: <a href="http://nagios.sourceforge.net/docs/3_0/perfdata.html">http://nagios.sourceforge.net/docs/3_0/perfdata.html</a> Typically, you would install an addon for graphing the performance data. A popular one is <a href="http://www.pnp4nagios.org">http://www.pnp4nagios.org</a> The "-f" flag in your example causes the plugin to generate plugin performance data.