Shell Programming and Scripting

#!/bin/bash
echo -n "Please Make Sure You Enter An Integer Number"

read integer
if [ “$integer” -lt 0 -o “$integer” -eq 0 -o “$integer” -gt 0 ]
then echo “ You Entered the integer  $integer correctly Congratulations”
else

fi

i=
while [[ -z $i ]]       # while i is empty 
do
    printf "enter integer: "
    read i
    if [[ -z ${i//[0-9]/} ]]    #true when i has all digits
    then
        echo "well done"
    else
        echo "try again"         #non-digit in the user response
        i=
    fi
done