#!/bin/bash

if [ $# -ne 1 ]; 
then
echo "Specify directory like this: $0 DirectoryName"
else

pushd $1

`date >> md5sums.txt`
for file in `ls` 
do
echo "Processing  $file ..."; # or whatever you want to do
`openssl dgst -md5 $file >> md5sums.txt`
done

echo "Done! Open md5sums.txt in $1 to view checksums."

popd
fi