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'.

-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)

-u, --idna-to-unicode

Convert from ACE according to IDNA

--allow-unassigned

Toggle IDNA AllowUnassigned flag (default=off)

--usestd3asciirules

Toggle IDNA UseSTD3ASCIIRules flag (default=off)

-t, --tld

Check string for TLD specific rules Only for --idna-to-ascii and --idna-to-unicode (default=on)

-p, --profile=STRING

Use specified stringprep profile instead Valid stringprep profiles are `Nameprep', `iSCSI', `Nodeprep', `Resourceprep', `trace', and `SASLprep'.

--debug

Print debugging information (default=off)

--quiet

Silent operation (default=off)

info libidn

should give you access to the complete manual.