I have found 2 flavors of check_squid. There is the plugin that is available on nagiosexchange, which is check_squid. This basically does a check to determine if the proxy can get to a url. Then there is check_squid.pl, a perl script that actually checks the number of file descriptors available. Whats weird is I can both to work from the command line, but cannot get either one to work from within nagios.
Services.cfg entry is check_command check_nrpe!check_squid!http://google.com!-!-!3128!-!-!2,
have tried any and all variants I could think of, and have exhausted what is out on google on it.
Any help would be very welcome.