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       idn - Internationalized Domain Names command line tool


       idn [OPTION]... [STRINGS]...


       Internationalized Domain Name (IDN) convert STRINGS, or standard input.

       Command line interface to the internationalized domain name library.

       All strings are expected to be encoded in the preferred charset used by
       your  locale.  Use ‘--debug’ to find out what this charset is.  You can
       override the charset used by setting environment variable CHARSET.

       To process a string that starts with ‘-’, for example ‘-foo’, use  ‘--’
       to signal the end of parameters, as in ‘idn --quiet -a -- -foo’.

       Mandatory  arguments  to  long  options are mandatory for short options

       -h, --help
              Print help and exit

       -V, --version
              Print version and exit

       -s, --stringprep
              Prepare string according to nameprep profile

       -d, --punycode-decode
              Decode Punycode

       -e, --punycode-encode
              Encode Punycode

       -a, --idna-to-ascii
              Convert to ACE according to IDNA (default mode)

       -u, --idna-to-unicode
              Convert from ACE according to IDNA

              Toggle IDNA AllowUnassigned flag (default off)

              Toggle IDNA UseSTD3ASCIIRules flag (default off)

              Don’t  check  string   for   TLD   specific   rules   Only   for
              --idna-to-ascii and --idna-to-unicode

       -n, --nfkc
              Normalize string according to Unicode v3.2 NFKC

       -p, --profile=STRING
              Use   specified  stringprep  profile  instead  Valid  stringprep
              profiles:  ‘Nameprep’,  ‘iSCSI’,   ‘Nodeprep’,   ‘Resourceprep’,
              ‘trace’, ‘SASLprep’

              Print debugging information

              Silent operation


       Written by Simon Josefsson.


       Report bugs to:
       GNU Libidn home page: <>
       General help using GNU software: <>


       Copyright © 2010 Simon Josefsson.  License GPLv3+: GNU GPL version 3 or
       later <>.
       This is free software: you are free  to  change  and  redistribute  it.
       There is NO WARRANTY, to the extent permitted by law.


       The  full  documentation for idn is maintained as a Texinfo manual.  If
       the info and idn programs are properly  installed  at  your  site,  the

              info idn

       should give you access to the complete manual.