[root@station19 ~]# perl nmap.pl 
<nmap-error>
  <pid="8711"/>
  <cmdline="'/usr/bin/nmap' -v -v -v -sS -p 16310-16316 -oX - localhost"/>
  <nmap-err>mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled. Try using --system-dns or specify valid servers with --dns_servers
</nmap-msg>
</nmap-error>