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#!/bin/bash
# heading index with div line
printf "\n "; # indent
for x in {0..15}; do printf "%-3x" $x; done;
printf "\n%46s\n" | sed 's/ /-/g;s/^/ /';
# two lines with dots to represent control chars
c=$(echo "fa" | xxd -p -r | iconv -f 'CP437//' -t 'UTF-8')
printf "%32s" | sed 's/../'"$c"' /g;s/^/ 0 /;s/$/\n\n/'
printf "%32s" | sed 's/../'"$c"' /g;s/^/ 1 /'
# convert dec to codepage 437 in a table
for x in {32..255};
do
# newline every 16 translated code values
(( x % 16 == 0 )) && printf "\n\n"
# left index numbers
let "n = x % 15"
(( (x % 16) == 0 )) && printf "%-4x" $n | sed 's/0/f/;s/^/ /'
# conversion of x integer value to symbol
printf "%02x" $x | xxd -p -r | iconv -f 'CP437//' -t 'UTF-8' | sed 's/.*/& /'
# div line
(( x == 127 )) && printf "%46s" | sed 's/ /-/g;s/^/ /;i\ '
done
printf "%46s" | sed 's/ /-/g;s/^/\n /;s/$/\n /'; # div line
for x in {0..15}; do printf "%-3x" $x; done;
echo
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