getbookcode.sh

#!/usr/bin/env bash
#author         :ormux
#date           :2019/08/31 (August 31)
#description    :generates a needed bookcode for my cryptographic puzzles.
#title          :getbookcode.sh
#usage          :bash getbookcode.sh

read -p "enter word/sentence: " word
line_num=1
word_idx=1

while read line; do

  for((i = word_idx; i <= ${#word}; i++)); do
    for j in $(seq 1 ${#line}); do

      if [[ "${word:i-1:1}" == "${line:j-1:1}" ]]; then
        echo $line_num:$j
        ((word_idx++))
        break 2
      fi

    done
  done

  ((line_num++))
done < text.txt