It may work, but I disagree that it is a good solution: it will blow up when $_->{Sub_URL} contains shell metacharacters, and is a security hole if that variable contains any user input.

See Calling External Commands More Safely. In this case I would recommend systemx from IPC::System::Simple, or at the very least the multi-argument system (as shown in other replies) with error checking (nobody showed this, but for an example see the first link).

sigh