Here is a simple way to clone or copy a machine, you can do that by copying the Virtual Hard disk drive (*.vmdk) file.
by using the command vmkfstools -i “SOURCEDISKIMAGE.vmdk” “TARGETDISKIMAGE.vmdk”
another example: vmkfstools –i /pathtoTemplateVM/template.vmdk /pathtoDestinationVM/newvm.vmdk
|S|A|R|M|A|D| 
Why do you need to do that?
You can also go to the VI client, connect to the esx server, browse the datastore (double click on the data store), create a new directory, then just right-click-copy and paste the vmdk file to the new directory.
@VaibhaV Sharma,
because it involves less steps, its shorter, and scriptable.