Array Sample

#!/bin/bash -e
typeset -a array
cat <<CAT | while read -a array
a b c d
b c d a
c d a b
d a b c
CAT
do
  echo ${array[@]} >> data
  typeset -i i
  for ((i = 0; i < ${#array[@]}; i++))
  do
    if echo ${array[$i]} | grep '^a' >& /dev/null
    then
      echo "${array[$i]} found"
    else
      echo 'not found'
    fi
  done
done