Script to retrieve vm info from esxi

Hi,

im trying to create a script, which would get basic (IP, MAC, Hostname) info from each vm running on each esxi. I need to run it in Linux. Since im new to this im not sure if i did all the steps correctly..:

I downloaded/installed:

VMware-vSphere-Perl-SDK-5.1.0-780721.x86_64.tar

this way i can execute command to get at least simple info:

esxcli --server x.x.x.x --username user --password passwd --formatter=csv network vm list >>/tmp/rrr.csv

however, this doesnt run on older esx versions...

Please let me know - correct me how to proceed with the script-commands

Thx