radiotelephony_spelling.sh

#!/usr/bin/env bash

declare -A CHART=(
	["a"]="alpha" ["b"]="bravo" ["c"]="charlie"
	["d"]="delta" ["e"]="echo" ["f"]="foxtrot"
	["g"]="golf" ["h"]="hotel" ["i"]="india"
	["j"]="juliet" ["k"]="kilo" ["l"]="lima"
	["m"]="mike" ["n"]="november" ["o"]="oscar"
	["p"]="papa" ["q"]="quebec" ["r"]="romeo"
	["s"]="sierra" ["t"]="tango" ["u"]="uniform"
	["v"]="victor" ["w"]="whiskey" ["x"]="x-ray"
	["y"]="yankee" ["z"]="zulu"
)
for _c in "${!CHART[@]}"; do
	CHART["${_c^^}"]="${CHART[${_c}]^^}"
done
CHART+=(
	["1"]="ONE" ["2"]="TWO" ["3"]="THREE"
	["4"]="FOUR" ["5"]="FIVE" ["6"]="SIX"
	["7"]="SEVEN" ["8"]="EIGHT" ["9"]="NINE"
	["0"]="ZERO" ["!"]="exclamation" ["?"]="questionmark"
	["#"]="hash" ["&"]="ampersand" ["+"]="plus"
	["-"]="dash" ["|"]="pipe" ["$"]="dollar"
	["%"]="percent" ["_"]="underscore" ["/"]="slash"
	['\']="backslash" ["*"]="asterisk" ["@"]="at"
	["="]="equals" ["("]="left parenthesis" [")"]="right parenthesis"
	["["]="square bracket open" ["]"]="square bracket closed" ["{"]="brace open"
	["}"]="brace closed" ["."]="dot" [","]="comma"
	[";"]="semicolon" [":"]="colon"
)

INPUT="${*}"
for ((i = 0; i < ${#INPUT}; i++)); do
	_c="${INPUT:i:1}"
	case "${_c}" in
		" ") printf '\t' ;;
		*) printf '[%s]%s ' "${_c}" "${CHART["${_c}"]}" ;;
	esac
done