needs a lot of tweaking

first in perl as other mentioned install Nagios::Plugin then install Crypt::SSLeay install Compress::Zlib install Class::MethodMaker
if you get the error “Permission to perform this operation was denied.” the set Permissions on ESX (i) check. The created user must be in the group users and be placed under Permissions to Read Only.

if you get :
SSL_verify_mode of SSL_VERIFY_NONE for client is depreciated!
then #perl -MCPAN -e shell
#install GAAS/libwww-perl-5.837.tar.gz
#install GAAS/Net-HTTP-6.03.tar.gz
information got from the forum :
http://communities.vmware.com/message/2202177