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Eugene Yarmash
Asked: 2011-11-27 14:59:07 +0800 CST

How can I convert an IDN to Punycode in bash?

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What is the easiest way to convert an IDN (such as президент.рф) to Punycode in bash?

linux bash idn

3 Answers

  1. Best Answer

    Take a look at the idn:

    [U] net-dns/libidn
     Available versions:  1.22 (~)1.22-r1 {doc elibc_FreeBSD emacs java mono nls static-libs}
     Installed versions:  1.22(03:12:19 PM 07/04/2011)(nls static-libs -doc -elibc_FreeBSD -emacs -java -mono)
     Homepage:            http://www.gnu.org/software/libidn/
     Description:         Internationalized Domain Names (IDN) implementation

    For e.g:

    $ echo "президент.рф" | idn
xn--d1abbgf6aiiy.xn--p1ai
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  2. Assuming you have python on your system, python -c 'import sys;print sys.argv[1].decode("utf-8").encode("idna")' "президент.рф" would do the trick.

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  3. In MacOS brew install homebrew/versions/libidn2.

    Then echo "президент.рф" | idn2.

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