$ number-to-words --lang=fr 42
quarante-deux

$ number-to-words --lang=it 42
quarantadue

$ number-to-words --lang=es 42
cuarenta y dos

$ number-to-words --lang=en 42
forty-two

$ number-to-words --lang=se 42
fyrtio-två

$ number-to-words --lang=nl 42
tweeenveertig

$ number-to-words --lang=roman 42
XLII

$ number-to-words --lang=roman --unicode 42
ⅩⅬⅡ

$ number-to-words --lang=aegean 42
𐄓𐄈

$ number-to-words 42
forty-two

$ number-to-words --lang=all 42
forty-two
quarante-deux
quarantadue
cuarenta y dos
fyrtio-två
tweeenveertig
XLII
𐄓𐄈

$ number-to-words --lang=all 1
one
un
uno
uno
en
één
I
𐄇

$ number-to-words --lang=all 1337
one thousand three hundred thirty-seven
mille trois cent trente-sept
uno mille trecento trentasette
un mil trescientos treinta y siete
en tusen tre hundra trettio-sju
éénduizend driehonderdzevenendertig
MCCCXXXVII
𐄢𐄛𐄒𐄍

$ number-to-words --lang=all 1234567890
one billion two hundred thirty-four million five hundred sixty-seven thousand eight hundred ninety
un milliard deux cent trente-quatre millions cinq cent soixante-sept mille huit cent quatre-vingt-dix
uno miliardo duecento trentaquattro milione cinquecento sessentasette mille ottocento novanta
un mil millones doscientos treinta y cuatro millones quinientos sesenta y siete mil ochocientos noventa
en miljarder två hundra trettio-fyra miljoner fem hundra sextio-sju tusen åtta hundra nittio
één miljard tweehonderdvierendertig miljoen vijfhonderdzevenenzestigduizend achthonderdnegentig

$ number-to-words --lang=all 1000000000000
one trillion
un billion
uno triliardo
un billón
en biljoner
één biljoen
too big number
too big number

$ number-to-words -h
NAME:
   number-to-words - number to number

USAGE:
   number-to-words [global options] command [command options] [arguments...]

VERSION:
   0.1.0

AUTHOR(S):
   Manfred Touron <https://github.com/moul/number-to-words>

COMMANDS:
GLOBAL OPTIONS:
   --lang value, -l value   Set language (default: "en") [$NTW_LANGUAGE]
   --help, -h               show help
   --version, -v            print the version

$ for i in {1..20}; do ./number-to-words -l roman -u $i; done
Ⅰ
Ⅱ
Ⅲ
Ⅳ
Ⅴ
Ⅵ
Ⅶ
Ⅷ
Ⅸ
Ⅹ
Ⅺ
Ⅻ
ⅩⅢ
ⅩⅣ
ⅩⅤ
ⅩⅥ
ⅩⅦ
ⅩⅧ
ⅩⅨ
ⅩⅩ