A bash script for generating animal-based ids using letters and numbers

animals.bash

#!/bin/bash

# get env

letter="$ANIMAL_LETTER"
index="$ANIMAL_INDEX"

# validate else error

if [ -z "$letter" ]; then
	>&2 echo "Please input a letter in lowercase using \`export ANIMAL_LETTER=<letter>\`"
	exit 1;
fi

# default index is 1
[ -z "$index" ] && index="1"

# perform the bazillion checks

[[ "$letter" == "a" ]] && [[ "$index" == "1" ]] && animal=aardvark
[[ "$letter" == "a" ]] && [[ "$index" == "2" ]] && animal=ant
[[ "$letter" == "a" ]] && [[ "$index" == "3" ]] && animal=african-tree-pangolin
[[ "$letter" == "a" ]] && [[ "$index" == "4" ]] && animal=albatross
[[ "$letter" == "a" ]] && [[ "$index" == "5" ]] && animal=alligator
[[ "$letter" == "a" ]] && [[ "$index" == "6" ]] && animal=alpaca
[[ "$letter" == "a" ]] && [[ "$index" == "7" ]] && animal=anaconda
[[ "$letter" == "a" ]] && [[ "$index" == "8" ]] && animal=armadillo
[[ "$letter" == "a" ]] && [[ "$index" == "9" ]] && animal=aye-aye
[[ "$letter" == "b" ]] && [[ "$index" == "1" ]] && animal=blowfish
[[ "$letter" == "b" ]] && [[ "$index" == "2" ]] && animal=black-widow-spider
[[ "$letter" == "b" ]] && [[ "$index" == "3" ]] && animal=black-bear
[[ "$letter" == "b" ]] && [[ "$index" == "4" ]] && animal=bison
[[ "$letter" == "b" ]] && [[ "$index" == "5" ]] && animal=bearded-dragon
[[ "$letter" == "b" ]] && [[ "$index" == "6" ]] && animal=bee
[[ "$letter" == "b" ]] && [[ "$index" == "7" ]] && animal=beaver
[[ "$letter" == "b" ]] && [[ "$index" == "8" ]] && animal=blue-jay
[[ "$letter" == "b" ]] && [[ "$index" == "9" ]] && animal=bird
[[ "$letter" == "b" ]] && [[ "$index" == "10" ]] && animal=boa
[[ "$letter" == "b" ]] && [[ "$index" == "11" ]] && animal=buck
[[ "$letter" == "b" ]] && [[ "$index" == "12" ]] && animal=bonobo
[[ "$letter" == "b" ]] && [[ "$index" == "13" ]] && animal=bornean-orang-utan
[[ "$letter" == "b" ]] && [[ "$index" == "14" ]] && animal=brown-bear
[[ "$letter" == "b" ]] && [[ "$index" == "15" ]] && animal=bat
[[ "$letter" == "b" ]] && [[ "$index" == "16" ]] && animal=budgie
[[ "$letter" == "b" ]] && [[ "$index" == "17" ]] && animal=buffalo
[[ "$letter" == "b" ]] && [[ "$index" == "18" ]] && animal=bull
[[ "$letter" == "b" ]] && [[ "$index" == "19" ]] && animal=butterfly
[[ "$letter" == "b" ]] && [[ "$index" == "20" ]] && animal=buzzard
[[ "$letter" == "b" ]] && [[ "$index" == "21" ]] && animal=border-collie
[[ "$letter" == "b" ]] && [[ "$index" == "22" ]] && animal=bob-cat
[[ "$letter" == "b" ]] && [[ "$index" == "23" ]] && animal=bass
[[ "$letter" == "b" ]] && [[ "$index" == "24" ]] && animal=basilisk
[[ "$letter" == "b" ]] && [[ "$index" == "25" ]] && animal=barnacle
[[ "$letter" == "b" ]] && [[ "$index" == "26" ]] && animal=bandicoot
[[ "$letter" == "b" ]] && [[ "$index" == "27" ]] && animal=badger
[[ "$letter" == "b" ]] && [[ "$index" == "28" ]] && animal=baboon
[[ "$letter" == "b" ]] && [[ "$index" == "29" ]] && animal=barracuda
[[ "$letter" == "c" ]] && [[ "$index" == "1" ]] && animal=caribou
[[ "$letter" == "c" ]] && [[ "$index" == "2" ]] && animal=crab
[[ "$letter" == "c" ]] && [[ "$index" == "3" ]] && animal=crane
[[ "$letter" == "c" ]] && [[ "$index" == "4" ]] && animal=crawfish
[[ "$letter" == "c" ]] && [[ "$index" == "5" ]] && animal=chicken
[[ "$letter" == "c" ]] && [[ "$index" == "6" ]] && animal=centipede
[[ "$letter" == "c" ]] && [[ "$index" == "7" ]] && animal=carp
[[ "$letter" == "c" ]] && [[ "$index" == "8" ]] && animal=cat
[[ "$letter" == "c" ]] && [[ "$index" == "9" ]] && animal=canary
[[ "$letter" == "c" ]] && [[ "$index" == "10" ]] && animal=camel
[[ "$letter" == "c" ]] && [[ "$index" == "11" ]] && animal=caiman-lizard
[[ "$letter" == "c" ]] && [[ "$index" == "12" ]] && animal=cheetah
[[ "$letter" == "c" ]] && [[ "$index" == "13" ]] && animal=chameleon
[[ "$letter" == "c" ]] && [[ "$index" == "14" ]] && animal=coyote
[[ "$letter" == "c" ]] && [[ "$index" == "15" ]] && animal=coho
[[ "$letter" == "c" ]] && [[ "$index" == "16" ]] && animal=cougar
[[ "$letter" == "c" ]] && [[ "$index" == "17" ]] && animal=cod
[[ "$letter" == "c" ]] && [[ "$index" == "18" ]] && animal=cockroach
[[ "$letter" == "c" ]] && [[ "$index" == "19" ]] && animal=cockatoo
[[ "$letter" == "c" ]] && [[ "$index" == "20" ]] && animal=cockatiel
[[ "$letter" == "c" ]] && [[ "$index" == "21" ]] && animal=cocker-spaniel
[[ "$letter" == "c" ]] && [[ "$index" == "22" ]] && animal=cobra
[[ "$letter" == "c" ]] && [[ "$index" == "23" ]] && animal=chupacabra
[[ "$letter" == "c" ]] && [[ "$index" == "24" ]] && animal=clam
[[ "$letter" == "c" ]] && [[ "$index" == "25" ]] && animal=chipmunk
[[ "$letter" == "c" ]] && [[ "$index" == "26" ]] && animal=chinchilla
[[ "$letter" == "c" ]] && [[ "$index" == "27" ]] && animal=chihuahua
[[ "$letter" == "c" ]] && [[ "$index" == "28" ]] && animal=chimpanzee
[[ "$letter" == "c" ]] && [[ "$index" == "29" ]] && animal=cow
[[ "$letter" == "c" ]] && [[ "$index" == "30" ]] && animal=cricket
[[ "$letter" == "c" ]] && [[ "$index" == "31" ]] && animal=crow
[[ "$letter" == "d" ]] && [[ "$index" == "1" ]] && animal=dolphin
[[ "$letter" == "d" ]] && [[ "$index" == "2" ]] && animal=dormouse
[[ "$letter" == "d" ]] && [[ "$index" == "3" ]] && animal=dove
[[ "$letter" == "d" ]] && [[ "$index" == "4" ]] && animal=dragonfly
[[ "$letter" == "d" ]] && [[ "$index" == "5" ]] && animal=drake
[[ "$letter" == "d" ]] && [[ "$index" == "6" ]] && animal=duck
[[ "$letter" == "d" ]] && [[ "$index" == "7" ]] && animal=doberman-pinscher
[[ "$letter" == "d" ]] && [[ "$index" == "8" ]] && animal=dinosaur
[[ "$letter" == "d" ]] && [[ "$index" == "9" ]] && animal=dingo
[[ "$letter" == "d" ]] && [[ "$index" == "10" ]] && animal=dik-dik
[[ "$letter" == "d" ]] && [[ "$index" == "11" ]] && animal=dog
[[ "$letter" == "d" ]] && [[ "$index" == "12" ]] && animal=dacshund
[[ "$letter" == "d" ]] && [[ "$index" == "13" ]] && animal=dalmation
[[ "$letter" == "d" ]] && [[ "$index" == "14" ]] && animal=du-gong
[[ "$letter" == "d" ]] && [[ "$index" == "15" ]] && animal=donkey
[[ "$letter" == "d" ]] && [[ "$index" == "16" ]] && animal=dolly-varden
[[ "$letter" == "d" ]] && [[ "$index" == "17" ]] && animal=deer
[[ "$letter" == "e" ]] && [[ "$index" == "1" ]] && animal=earwig
[[ "$letter" == "e" ]] && [[ "$index" == "2" ]] && animal=emu
[[ "$letter" == "e" ]] && [[ "$index" == "3" ]] && animal=erne
[[ "$letter" == "e" ]] && [[ "$index" == "4" ]] && animal=elk
[[ "$letter" == "e" ]] && [[ "$index" == "5" ]] && animal=eel
[[ "$letter" == "e" ]] && [[ "$index" == "6" ]] && animal=eclectus
[[ "$letter" == "e" ]] && [[ "$index" == "7" ]] && animal=egret
[[ "$letter" == "e" ]] && [[ "$index" == "8" ]] && animal=earthworm
[[ "$letter" == "e" ]] && [[ "$index" == "9" ]] && animal=eagle
[[ "$letter" == "e" ]] && [[ "$index" == "10" ]] && animal=echidna
[[ "$letter" == "f" ]] && [[ "$index" == "1" ]] && animal=flamingo
[[ "$letter" == "f" ]] && [[ "$index" == "2" ]] && animal=frog
[[ "$letter" == "f" ]] && [[ "$index" == "3" ]] && animal=falcon
[[ "$letter" == "f" ]] && [[ "$index" == "4" ]] && animal=finch
[[ "$letter" == "f" ]] && [[ "$index" == "5" ]] && animal=fly
[[ "$letter" == "f" ]] && [[ "$index" == "6" ]] && animal=fish
[[ "$letter" == "f" ]] && [[ "$index" == "7" ]] && animal=fox
[[ "$letter" == "f" ]] && [[ "$index" == "8" ]] && animal=ferret
[[ "$letter" == "f" ]] && [[ "$index" == "9" ]] && animal=flatworm
[[ "$letter" == "f" ]] && [[ "$index" == "10" ]] && animal=firefly
[[ "$letter" == "g" ]] && [[ "$index" == "1" ]] && animal=goose
[[ "$letter" == "g" ]] && [[ "$index" == "2" ]] && animal=gopher
[[ "$letter" == "g" ]] && [[ "$index" == "3" ]] && animal=grasshopper
[[ "$letter" == "g" ]] && [[ "$index" == "4" ]] && animal=goat
[[ "$letter" == "g" ]] && [[ "$index" == "5" ]] && animal=gazelle
[[ "$letter" == "g" ]] && [[ "$index" == "6" ]] && animal=giraffe
[[ "$letter" == "g" ]] && [[ "$index" == "7" ]] && animal=gnat
[[ "$letter" == "g" ]] && [[ "$index" == "8" ]] && animal=groundhog
[[ "$letter" == "g" ]] && [[ "$index" == "9" ]] && animal=green-poison-dart-fro
[[ "$letter" == "g" ]] && [[ "$index" == "10" ]] && animal=gorilla
[[ "$letter" == "h" ]] && [[ "$index" == "1" ]] && animal=hyena
[[ "$letter" == "h" ]] && [[ "$index" == "2" ]] && animal=horse
[[ "$letter" == "h" ]] && [[ "$index" == "3" ]] && animal=hare
[[ "$letter" == "h" ]] && [[ "$index" == "4" ]] && animal=hawk
[[ "$letter" == "h" ]] && [[ "$index" == "5" ]] && animal=hedgehog
[[ "$letter" == "h" ]] && [[ "$index" == "6" ]] && animal=heron
[[ "$letter" == "h" ]] && [[ "$index" == "7" ]] && animal=herring
[[ "$letter" == "h" ]] && [[ "$index" == "8" ]] && animal=hyrax
[[ "$letter" == "h" ]] && [[ "$index" == "9" ]] && animal=hippopotamus
[[ "$letter" == "i" ]] && [[ "$index" == "1" ]] && animal=iguanodon
[[ "$letter" == "i" ]] && [[ "$index" == "2" ]] && animal=inchworm
[[ "$letter" == "i" ]] && [[ "$index" == "3" ]] && animal=impala
[[ "$letter" == "i" ]] && [[ "$index" == "4" ]] && animal=iguana
[[ "$letter" == "i" ]] && [[ "$index" == "5" ]] && animal=insect
[[ "$letter" == "j" ]] && [[ "$index" == "1" ]] && animal=june-bug
[[ "$letter" == "j" ]] && [[ "$index" == "2" ]] && animal=jaguar
[[ "$letter" == "j" ]] && [[ "$index" == "3" ]] && animal=jackrabbit
[[ "$letter" == "j" ]] && [[ "$index" == "4" ]] && animal=jackal
[[ "$letter" == "k" ]] && [[ "$index" == "1" ]] && animal=komodo-dragon
[[ "$letter" == "k" ]] && [[ "$index" == "2" ]] && animal=koala
[[ "$letter" == "k" ]] && [[ "$index" == "3" ]] && animal=krill
[[ "$letter" == "k" ]] && [[ "$index" == "4" ]] && animal=kookaburra
[[ "$letter" == "k" ]] && [[ "$index" == "5" ]] && animal=kangaroo
[[ "$letter" == "l" ]] && [[ "$index" == "1" ]] && animal=lobster
[[ "$letter" == "l" ]] && [[ "$index" == "2" ]] && animal=lion
[[ "$letter" == "l" ]] && [[ "$index" == "3" ]] && animal=lice
[[ "$letter" == "l" ]] && [[ "$index" == "4" ]] && animal=leopard
[[ "$letter" == "l" ]] && [[ "$index" == "5" ]] && animal=lemming
[[ "$letter" == "l" ]] && [[ "$index" == "6" ]] && animal=leech
[[ "$letter" == "l" ]] && [[ "$index" == "7" ]] && animal=leatherback-sea-turtl
[[ "$letter" == "l" ]] && [[ "$index" == "8" ]] && animal=lancelet
[[ "$letter" == "l" ]] && [[ "$index" == "9" ]] && animal=lamb
[[ "$letter" == "l" ]] && [[ "$index" == "10" ]] && animal=lynx
[[ "$letter" == "l" ]] && [[ "$index" == "11" ]] && animal=lama
[[ "$letter" == "m" ]] && [[ "$index" == "1" ]] && animal=mink
[[ "$letter" == "m" ]] && [[ "$index" == "2" ]] && animal=meerkat
[[ "$letter" == "m" ]] && [[ "$index" == "3" ]] && animal=muskox
[[ "$letter" == "m" ]] && [[ "$index" == "4" ]] && animal=marsupials
[[ "$letter" == "m" ]] && [[ "$index" == "5" ]] && animal=marmot
[[ "$letter" == "m" ]] && [[ "$index" == "6" ]] && animal=muskrat
[[ "$letter" == "m" ]] && [[ "$index" == "7" ]] && animal=manatee
[[ "$letter" == "m" ]] && [[ "$index" == "8" ]] && animal=mouse
[[ "$letter" == "m" ]] && [[ "$index" == "9" ]] && animal=man-of-war
[[ "$letter" == "m" ]] && [[ "$index" == "10" ]] && animal=mollusks
[[ "$letter" == "m" ]] && [[ "$index" == "11" ]] && animal=monkey
[[ "$letter" == "m" ]] && [[ "$index" == "12" ]] && animal=moose
[[ "$letter" == "m" ]] && [[ "$index" == "13" ]] && animal=mule
[[ "$letter" == "m" ]] && [[ "$index" == "14" ]] && animal=mole
[[ "$letter" == "n" ]] && [[ "$index" == "1" ]] && animal=narwhal
[[ "$letter" == "n" ]] && [[ "$index" == "2" ]] && animal=nautilus
[[ "$letter" == "n" ]] && [[ "$index" == "3" ]] && animal=newt
[[ "$letter" == "o" ]] && [[ "$index" == "1" ]] && animal=ox
[[ "$letter" == "o" ]] && [[ "$index" == "2" ]] && animal=owl
[[ "$letter" == "o" ]] && [[ "$index" == "3" ]] && animal=otter
[[ "$letter" == "o" ]] && [[ "$index" == "4" ]] && animal=ostrich
[[ "$letter" == "o" ]] && [[ "$index" == "5" ]] && animal=osprey
[[ "$letter" == "o" ]] && [[ "$index" == "6" ]] && animal=opossum
[[ "$letter" == "o" ]] && [[ "$index" == "7" ]] && animal=orangutan
[[ "$letter" == "o" ]] && [[ "$index" == "8" ]] && animal=octopus
[[ "$letter" == "o" ]] && [[ "$index" == "9" ]] && animal=ocelot
[[ "$letter" == "o" ]] && [[ "$index" == "10" ]] && animal=orca
[[ "$letter" == "p" ]] && [[ "$index" == "1" ]] && animal=panda
[[ "$letter" == "p" ]] && [[ "$index" == "2" ]] && animal=peacock
[[ "$letter" == "p" ]] && [[ "$index" == "3" ]] && animal=pelican
[[ "$letter" == "p" ]] && [[ "$index" == "4" ]] && animal=penguin
[[ "$letter" == "p" ]] && [[ "$index" == "5" ]] && animal=pig
[[ "$letter" == "p" ]] && [[ "$index" == "6" ]] && animal=platypus
[[ "$letter" == "p" ]] && [[ "$index" == "7" ]] && animal=polar-bear
[[ "$letter" == "p" ]] && [[ "$index" == "8" ]] && animal=porcupine
[[ "$letter" == "p" ]] && [[ "$index" == "9" ]] && animal=prawn
[[ "$letter" == "p" ]] && [[ "$index" == "10" ]] && animal=puma
[[ "$letter" == "q" ]] && [[ "$index" == "1" ]] && animal=quetzal
[[ "$letter" == "q" ]] && [[ "$index" == "2" ]] && animal=quail
[[ "$letter" == "r" ]] && [[ "$index" == "1" ]] && animal=raccoon
[[ "$letter" == "r" ]] && [[ "$index" == "2" ]] && animal=rooster
[[ "$letter" == "r" ]] && [[ "$index" == "3" ]] && animal=robin
[[ "$letter" == "r" ]] && [[ "$index" == "4" ]] && animal=ringworm
[[ "$letter" == "r" ]] && [[ "$index" == "5" ]] && animal=ray
[[ "$letter" == "r" ]] && [[ "$index" == "6" ]] && animal=roundworm
[[ "$letter" == "r" ]] && [[ "$index" == "7" ]] && animal=rabbit
[[ "$letter" == "r" ]] && [[ "$index" == "8" ]] && animal=rat
[[ "$letter" == "r" ]] && [[ "$index" == "9" ]] && animal=rhino
[[ "$letter" == "s" ]] && [[ "$index" == "1" ]] && animal=shrimp
[[ "$letter" == "s" ]] && [[ "$index" == "2" ]] && animal=scorpion
[[ "$letter" == "s" ]] && [[ "$index" == "3" ]] && animal=scallop
[[ "$letter" == "s" ]] && [[ "$index" == "4" ]] && animal=sea-anemone
[[ "$letter" == "s" ]] && [[ "$index" == "5" ]] && animal=seal
[[ "$letter" == "s" ]] && [[ "$index" == "6" ]] && animal=salmon
[[ "$letter" == "s" ]] && [[ "$index" == "7" ]] && animal=snake
[[ "$letter" == "s" ]] && [[ "$index" == "8" ]] && animal=siberian-husky
[[ "$letter" == "s" ]] && [[ "$index" == "9" ]] && animal=sheep
[[ "$letter" == "s" ]] && [[ "$index" == "10" ]] && animal=sandpiper
[[ "$letter" == "s" ]] && [[ "$index" == "11" ]] && animal=skunks
[[ "$letter" == "s" ]] && [[ "$index" == "12" ]] && animal=shark
[[ "$letter" == "s" ]] && [[ "$index" == "13" ]] && animal=sloth
[[ "$letter" == "s" ]] && [[ "$index" == "14" ]] && animal=slender-loris
[[ "$letter" == "s" ]] && [[ "$index" == "15" ]] && animal=stork
[[ "$letter" == "s" ]] && [[ "$index" == "16" ]] && animal=squirrel
[[ "$letter" == "s" ]] && [[ "$index" == "17" ]] && animal=squid
[[ "$letter" == "s" ]] && [[ "$index" == "18" ]] && animal=swan
[[ "$letter" == "s" ]] && [[ "$index" == "19" ]] && animal=sponge
[[ "$letter" == "s" ]] && [[ "$index" == "20" ]] && animal=somali-wild-ass
[[ "$letter" == "s" ]] && [[ "$index" == "21" ]] && animal=snails
[[ "$letter" == "s" ]] && [[ "$index" == "22" ]] && animal=slugs
[[ "$letter" == "s" ]] && [[ "$index" == "23" ]] && animal=spectacled-bear
[[ "$letter" == "t" ]] && [[ "$index" == "1" ]] && animal=terrapin
[[ "$letter" == "t" ]] && [[ "$index" == "2" ]] && animal=turtle
[[ "$letter" == "t" ]] && [[ "$index" == "3" ]] && animal=tick
[[ "$letter" == "t" ]] && [[ "$index" == "4" ]] && animal=trout
[[ "$letter" == "t" ]] && [[ "$index" == "5" ]] && animal=turkey
[[ "$letter" == "t" ]] && [[ "$index" == "6" ]] && animal=tapeworm
[[ "$letter" == "t" ]] && [[ "$index" == "7" ]] && animal=tamarin
[[ "$letter" == "t" ]] && [[ "$index" == "8" ]] && animal=tadpole
[[ "$letter" == "t" ]] && [[ "$index" == "9" ]] && animal=tasmanian-devil
[[ "$letter" == "t" ]] && [[ "$index" == "10" ]] && animal=tapir
[[ "$letter" == "t" ]] && [[ "$index" == "11" ]] && animal=tortoise
[[ "$letter" == "t" ]] && [[ "$index" == "12" ]] && animal=tarpan
[[ "$letter" == "t" ]] && [[ "$index" == "13" ]] && animal=tazmanian-devil
[[ "$letter" == "t" ]] && [[ "$index" == "14" ]] && animal=tiger
[[ "$letter" == "u" ]] && [[ "$index" == "1" ]] && animal=urchin
[[ "$letter" == "u" ]] && [[ "$index" == "2" ]] && animal=uakari
[[ "$letter" == "u" ]] && [[ "$index" == "3" ]] && animal=urutu
[[ "$letter" == "v" ]] && [[ "$index" == "1" ]] && animal=vervet
[[ "$letter" == "v" ]] && [[ "$index" == "2" ]] && animal=vicuna
[[ "$letter" == "v" ]] && [[ "$index" == "3" ]] && animal=viper
[[ "$letter" == "v" ]] && [[ "$index" == "4" ]] && animal=vulture
[[ "$letter" == "v" ]] && [[ "$index" == "5" ]] && animal=velociraptor
[[ "$letter" == "v" ]] && [[ "$index" == "6" ]] && animal=vole
[[ "$letter" == "v" ]] && [[ "$index" == "7" ]] && animal=velvet-worm
[[ "$letter" == "w" ]] && [[ "$index" == "1" ]] && animal=white-tailed-dear
[[ "$letter" == "w" ]] && [[ "$index" == "2" ]] && animal=walrus
[[ "$letter" == "w" ]] && [[ "$index" == "3" ]] && animal=wren
[[ "$letter" == "w" ]] && [[ "$index" == "4" ]] && animal=widow-spider
[[ "$letter" == "w" ]] && [[ "$index" == "5" ]] && animal=woodpecker
[[ "$letter" == "w" ]] && [[ "$index" == "6" ]] && animal=whale
[[ "$letter" == "w" ]] && [[ "$index" == "7" ]] && animal=wolverine
[[ "$letter" == "w" ]] && [[ "$index" == "8" ]] && animal=wolf
[[ "$letter" == "w" ]] && [[ "$index" == "9" ]] && animal=weevil
[[ "$letter" == "w" ]] && [[ "$index" == "10" ]] && animal=woodchuck
[[ "$letter" == "w" ]] && [[ "$index" == "11" ]] && animal=whooper
[[ "$letter" == "w" ]] && [[ "$index" == "12" ]] && animal=whippet
[[ "$letter" == "w" ]] && [[ "$index" == "13" ]] && animal=wallaby
[[ "$letter" == "w" ]] && [[ "$index" == "14" ]] && animal=water-dragons
[[ "$letter" == "w" ]] && [[ "$index" == "15" ]] && animal=wasp
[[ "$letter" == "w" ]] && [[ "$index" == "16" ]] && animal=warthog
[[ "$letter" == "w" ]] && [[ "$index" == "17" ]] && animal=warbler
[[ "$letter" == "w" ]] && [[ "$index" == "18" ]] && animal=weasel
[[ "$letter" == "y" ]] && [[ "$index" == "1" ]] && animal=yorkshire-terrier
[[ "$letter" == "y" ]] && [[ "$index" == "2" ]] && animal=yeti
[[ "$letter" == "y" ]] && [[ "$index" == "3" ]] && animal=yak
[[ "$letter" == "y" ]] && [[ "$index" == "4" ]] && animal=yellow-belly-sapsucke
[[ "$letter" == "y" ]] && [[ "$index" == "5" ]] && animal=yellow-finned-tuna
[[ "$letter" == "z" ]] && [[ "$index" == "1" ]] && animal=zorilla
[[ "$letter" == "z" ]] && [[ "$index" == "2" ]] && animal=zander
[[ "$letter" == "z" ]] && [[ "$index" == "3" ]] && animal=zebra
[[ "$letter" == "z" ]] && [[ "$index" == "4" ]] && animal=zebu

# echo result and reset env
echo $animal;
export ANIMAL_LETTER=""