Execute Bash Shell Online

#!/bin/bash
i=0

touch zzz
echo "a" >> zzz
echo "b" >> zzz
echo "c" >> zzz
echo "d" >> zzz

b=22

echo "$b" >> zzz




IFS='
' ttt=($(cat zzz))


while [ $i -le 4 ]
do
  echo ${ttt[$i]}
  let i=$i+1
done


echo ""
echo ""
echo "----------"
echo "   zzz    "
echo "----------"
echo ""
echo $(cat zzz)