raincode.sh - create a plausible random UK Ministry of Supply-style "Rainbow Code" name

raincode.sh

#!/bin/bash
# raincode.sh - create a plausible random UK Ministry of Supply-style
#               "Rainbow Code" name
# see: https://en.wikipedia.org/wiki/Rainbow_Code
# scruss, 2024-07

rainbow=(Black         Blue          Brown         Green         Indigo \
         Jade          Orange        Pink          Purple        Red \
         Violet        Yellow)

code=(Achilles      Anchor        Angel         Anvil         Apple \
      Archer        Arrow         Aster         Bacchus       Bacon \
      Badger        Bamboo        Banner        Barley        Beard \
      Biddy         Bishop        Blossom       Boar          Bottle \
      Boy           Bracket       Brick         Bunny         Cabbage \
      Carpet        Cat           Cedar         Cheeks        Cheese \
      Club          Cocktail      Corkscrew     Crop          Cyclops \
      Danube        Dean          Devil         Diamond       Diver \
      Dolphin       Drover        Duck          Duckling      Duster \
      Elsie         Envoy         Eye           Feather       Fever \
      Flag          Flannel       Flash         Flax          Fox \
      Friend        Garland       Garlic        Garter        Gate \
      Ginger        Granite       Grass         Hammer        Hammock \
      Harvest       Hawk          Heathen       Hebe          Herald \
      Hermes        Indian        Jack          Jacket        Janet \
      Jay           Joker         Kestrel       King          Knight \
      Label         Lagoon        Lemon         Light         Lizard \
      Mace          Maria         Mercury       Minnow        Mist \
      Moon          Neck          Nell          Oak           Orchid \
      Palm          Parrot        Passion       Peacock       Perseus \
      Picture       Pippin        Planet        Poodle        Possum \
      Prince        Putter        Queen         Ranger        Rapier \
      Reaper        Riband        River         Rock          Rose \
      Rosette       Saga          Salad         Sand          Sapphire \
      Satin         Sea           Setter        Shadow        Shield \
      Shoes         Shrimp        Silk          Sky           Slug \
      Snow          Sparkler      Star          Steel         Steer \
      Stone         Streak        Study         Sugar         Sun \
      Tartan        Temple        Thistle       Ticket        Tiger \
      Toffee        Top           Tulip         Veil          Vesta \
      Vision        Vixen         Vulcan        Walnut        Warrior \
      Water         William       Willow        Wizard        Yeoman)

len_rainbow="${#rainbow[@]}"
len_code="${#code[@]}"
RANDOM=$(date +%N | sed 's/^0*//')
rnd_rainbow="$((RANDOM % len_rainbow))"
RANDOM=$(date +%N | sed 's/^0*//')
rnd_code="$((RANDOM % len_code))"
echo "${rainbow[rnd_rainbow]}" "${code[rnd_code]}"