#!/bin/bash
# GNU bash, version 4.4.20(1)-release (x86_64-pc-linux-gnu)
# Copyright © 2016 Free Software Foundation, Inc.
#
# Linux Mint 19, current update as of 28-07-2019.
#
# Author B.Walker, G0LCU - Issued as CC0 licence, (Public Domain), to UNIX.COM.
#
# CP437.sh
# Fun IBM Style Pseudo-CodePage 437 Demo...
#
# NOTE: The standard ASCII characters REMAIN STANDARD!

chr=( ' ' '☺' '☻' '♥' '♦' '♣' '♠' '-' '�-�' '�-�' '�-�' '♂' '♀' '♪' '♫' '☼' '�-�' '�-�' '↕' '��' '¶' '§' '�-�' '↨' '↑' '↓' '�'' '←' '∟' '↔' '�-�' '�-�' ' ' '!' '"' '#' '$' '%' '&' "'" '(' ')' '*' '+' ',' '-' '.' '/' '0' '1' '2' '3' '4' '5' '6' '7' '8' '9' ':' ';' '<' '=' '>' '?' '@' 'A' 'B' 'C' 'D' 'E' 'F' 'G' 'H' 'I' 'J' 'K' 'L' 'M' 'N' 'O' 'P' 'Q' 'R' 'S' 'T' 'U' 'V' 'W' 'X' 'Y' 'Z' '[' '\' ']' '^' '_' '`' 'a' 'b' 'c' 'd' 'e' 'f' 'g' 'h' 'i' 'j' 'k' 'l' 'm' 'n' 'o' 'p' 'q' 'r' 's' 't' 'u' 'v' 'w' 'x' 'y' 'z' '{' '|' '}' '~' '⌂' 'Ç' 'ü' 'é' 'â' 'ä' 'à' 'å' 'ç' 'ê' 'ë' 'è' 'ï' 'î' 'ì' 'Ä' '�...' 'É' 'æ' 'Æ' 'ô' 'ö' 'ò' 'û' 'ù' 'ÿ' '�-' 'Ü' '¢' '£' '¥' '₧' '�'' 'á' 'í' 'ó' 'ú' 'ñ' 'Ñ' 'ª' 'º' '¿' '⌐' '¬' '½' '¼' '¡' '«' '»' '�-�' '�-'' '�-�' '│' '┤' '╡' '╢' '�-' '╕' '╣' '║' '�-' '╝' '╜' '╛' '┐' '└' '┴' '┬' '├' '─' '┼' '╞' '╟' '╚' '╔' '╩' '╦' '╠' '═' '╬' '╧' '╨' '╤' '╥' '╙' '╘' '�'' '╓' '╫' '╪' '┘' '┌' '�-�' '�-�' '�-�' '�-�' '�-�' 'α' 'ß' 'Γ' 'π' 'Σ' 'σ' 'µ' 'τ' 'Φ' 'Θ' 'Ω' 'δ' '∞' 'φ' 'ε' '∩' '≡' '±' '≥' '≤' '⌠' '⌡' '÷' '≈' '°' '∙' '·' '√' 'ⁿ' '²' '�-�' ' ' )

# This loop demonstrates array access.
for n in {0..255}
do
    # printf "Character ${n} = %s\n" "${chr[${n}]}"
    printf "%s" "${chr[${n}]}"
done > IBM_ASCII

# This section demonstrates 'bash' style string slicing from a variable.
echo ""
ext_ascii=$( cat IBM_ASCII )
echo "${ext_ascii}"
echo ""
echo "This is the full sized block character:- '"${ext_ascii:219:1}"'..."
echo "This is the NULL character, 0:- '"${ext_ascii:0:1}"', and is given a space character..."
echo "Similarly the BLANK character, 255:- '"${ext_ascii:255:1}"', and also given a space character..."
echo ""