#!/bin/sh
# This bash script, locates unique files using md5sum,
# and stores only one instance into another folder that
# the user specifies as an argument.


usage() {
	echo "Description:"
	echo "Identifies unique files by using md5sum "
        echo "and then copies them into a dirctory."
	echo
	echo "Usage: uniqfile [DIR]"
	echo
	echo "[DIR] is the path of the directory you  "
	echo "wish to backup your files               "
	echo 
	echo "Command line arguments are not optional."
}



if [ "$1" = "-h" -o "$1" = "--help" ]; then
	  usage
	    exit 0

   elif [ -z "$1" ]; then
    echo "Invalid arguments."
	exit 0    
	
	else
	    directory=$1

fi

echo "Calculating md5..."
files=$(md5sum * 2>/dev/null | sort -n | uniq --check-chars=32 | cut -d" " -f3)

echo "Copying the files..."
cp $files $directory

echo "Done."

exit