gistfile1.sh

#!/bin/bash

# This script may be used to backup files having a specific extension 

source="/path/to/source/dir"
dest="/path/to/rep/backup"

day=$(date +%d-%m-%Y)

# backup img files
shopt -s nullglob
for f in *.img
do
 file_dest="$f-$day.tar.gz"
 echo "-  Backing up $file_dest -----------------"
 tar czf $dest/$file_dest $source/$f
 echo "   ----- end ----------------------"
done

echo
echo "Backup finished"
echo 

ls -lh $dest