Script for diff the paragraph

diff.sh

#!/bin/bash
# used for checking grammar, it uses Internal Field Separator
# related link: https://stackoverflow.com/questions/454427/string-difference-in-bash
# todo: figuring out a better algorithm than checking word by word in a linear fashion

# Function to compare two words
compare_words() {
  local word1="$1"
  local word2="$2"
  if [[ "$word1" != "$word2" ]]; then
    echo "Difference found: '$word1' vs '$word2'"
  fi
}

# Main script

# Save strings as arguments or read from user input
if [ $# -eq 2 ]; then
  str1="$1"
  str2="$2"
else
  echo "Enter string 1:"
  read str1
  echo "Enter string 2:"
  read str2
fi

# Split strings into words using IFS
IFS=' ' read -r -a words1 <<< "$str1"
IFS=' ' read -r -a words2 <<< "$str2"

# Loop through words and compare them
for (( i=0; i<${#words1[@]}; i++ )); do
  if [[ ${#words2[@]} -gt $i ]]; then
    compare_words "${words1[$i]}" "${words2[$i]}"
  else
    echo "Extra word in string 1: '${words1[$i]}'"
  fi
done

# Check for extra words in string 2
for (( i=${#words1[@]}; i<${#words2[@]}; i++ )); do
  echo "Extra word in string 2: '${words2[$i]}'"
done