#!/bin/bash
echo " my for loop" 
for var in 1 2 3 4 5 6 7 8 9; 
do
    echo $var
done
echo " my while loop 1" 
sleep 3
counter1=0
while [ $counter1 -lt 10 ]; do
    echo $counter1
    let counter1=counter1+1
done
echo " my while loop 2" 
sleep 3
counter2=20
while [ $counter2 -gt 10 ]; do
    echo $counter2
    let counter2-=1
done