#!/bin/bash

TMPFILE='/tmp/update_progress'

rm $TMPFILE
touch $TMPFILE

echo "10" > $TMPFILE

echo -e "Update started...."

sleep 3

echo "40" > $TMPFILE

echo -e "Wait...."

sleep 3

echo "80" > $TMPFILE

echo -e "Done!"

sleep 2

echo "100" > $TMPFILE