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# cat vm.csv 
vm_name,vm_cluster
...
vm2,fd2
vm3,fd3
vm4,fd4

# cat vfiler_fd.csv 
vm_name,vFiler_IP,vFiler_cluster
...
vm4,1.1.1.4,fd1
vm1,1.1.1.1,fd4
vm2,1.1.1.2,fd3

vm_name,vm_cluster,vFiler_IP,vFiler_cluster
vm1,fd1,1.1.1.1,fd4
...
.
.
....etc.

use strict;
use Text::CSV;
...
      }    
      next;
}