Copy files with md5 duplicate check

md5copy.sh

if  [[ $1 ]]
then
	# make sure we have required argment
	echo "Attempting to copy files to $1"
else
	echo "No target destination specified"
	exit
fi
echo "Building md5 log"
# Unix timestamp filename
log=/tmp/md5copylog-`date +%s`.md5
# Empty it, just in case
> $log

# Build our md5 list by looping through the files in the destination folder and hashing each
for f in $1/*;
do
	# generate an md5 for this file
	m=`md5 -q "$f"`
	echo -n "."
	# append it to the log
	echo $m >> $log
done;

# now let's try to copy them
for f in *;
do
	# generate an md5 for this file
	m=`md5 -q "$f"`
	# check if it's in the log file we built
	if grep -q $m $log
	then
		echo "File $f exists in target, will not copy"
	else
		echo "File $f does not exist in target, will copy"
		cp "$f" "$1"
	fi
done