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Server Name/IP Converter

07.04.2007
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        When passed either an IPv4 address or the name of a domain or server, this script will return either a name or an IP, respectively.
#!/usr/bin/perl -w
use strict;
use Socket;
my $arg = shift;
if ($arg =~ /^(\d+\.){3}\d+$/) {
 print scalar gethostbyaddr(inet_aton($arg), AF_INET), "\n"
} else { printf "%vd\n", scalar gethostbyname $arg }