#!/bin/bash

MAX_NO=0
echo -n "Enter a number between (5 to 9): "
read MAX_NO

if ! [ $MAX_NO -ge 5 -a $MAX_NO -le 9 ]; then
   echo "Please enter a number between 5 and 9. Try again."
   exit 1
fi

clear

for ((i=1; i<=MAX_NO; i++)); do
    for ((s=MAX_NO; s>=i; s--)); do
        echo -n " "
    done
    for ((j=1; j<=i; j++)); do
        echo -n " ."
    done
    echo ""
done

###### Second stage ######################

for ((i=MAX_NO; i>=1; i--)); do
    for ((s=i; s<=MAX_NO; s++)); do
        echo -n " "
    done
    for ((j=1; j<=i; j++)); do
        echo -n " ."
    done
    echo ""
done

echo -e "\n\n\t\t\t Whenever you need help, Tecmint.com is always there"
