Nagios plug-in development guidelines

<a>Nagios plug-in development guidelines</a>

<a href="http://nagiosplug.sourceforge.net/developer-guidelines.html">http://nagiosplug.sourceforge.net/developer-guidelines.html</a>

plug-in API

<a href="http://nagios.sourceforge.net/docs/3_0/pluginapi.html">http://nagios.sourceforge.net/docs/3_0/pluginapi.html</a>

check_by_ssh

<a href="http://nagiosplugins.org/man/check_by_ssh">http://nagiosplugins.org/man/check_by_ssh</a>