blackletter.sh

#!/bin/bash

# Assignment
text=$@
letters=("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")
blackletters=("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")


for i in {1..52}; do
text=${text//${letters[$i]}/${blackletters[$i]}}
done

echo $text

exit 0