I would prefer the system() over the qx//. Apart from being more secure, you can test whether the command was successful. At the moment, you are using qx// in void context : capturing the output of the command and ingoring it. This is a waste of memory and CPU cycles.

I'd write it thus:

 {
      system("tar", "zxvf", $ARGV[0] . "/$list[$d]") == 0
           or print STDERR "Error running tar zxvf on $list[$d]";
      $i++;
 }
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my €0.02