word_in_word

#!/bin/bash
# check if word is within word
read -p 'please enter sentence :' answer
arr=($answer)
d=0

#  function check if word is in a word
word() {
if [[ $i = $d ]]
then
  : 
elif [[ ${arr[$d]} =~ "${arr[$i]}" ]]
then 
  echo "${arr[$i]} is in ${arr[$d]}"
fi
(( i++ ))
}

# loop through sentnce
for j in ${arr[@]}
do
  i=0
  for k in ${arr[@]}
  do
    word
  done
  (( d++ ))
done