Command line IDN punycode convertor

If you need a command line punycode converter for IDN (internationalized domain name), just write a small Perl program using Net-LibIDN(cpan).

On Fedora, do a "yum install perl-Net-LibIDN" to install Net-LibIDN.

To encode:
$cat en-puny.pl
#!/bin/env perl
use Net::LibIDN ':all';
print idn_to_ascii($ARGV[0],'utf-8') . "\n";

To decode:
$cat de-puny.pl
#!/bin/env perl
use Net::LibIDN ':all';
print idn_to_unicode($ARGV[0],'utf-8') . "\n";

Examples:
$./en-puny.pl 你我.中国
xn--6qqp96b.xn--fiqs8s

./de-puny.pl xn--6qqp96b.xn--fiqs8s
你我.中国

$./en-puny.pl ˆ.net
xn--wqa.net

To get punycode without "xn--" prefix, replace idn_to_ascii with idn_punycode_encode, and replace idn_to_unicode with idn_punycode_decode.