Write a shell program to display the alternate digits in a given 7 digit number starting from the first digit.

Code for Write a shell program to display the alternate digits in a given 7 digit number starting from the first digit in Unix / Linux / Ubuntu

echo Enter a 7 digit number
read num
n=1
while [ $n -le 7 ]
do
a=`echo $num | cut -c $n`
echo $a 
n=`expr $n + 2`
done