#!/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=$1fiecho "Calculating md5..."files=$(md5sum * 2>/dev/null | sort -n | uniq --check-chars=32 | cut -d" " -f3)echo "Copying the files..."cp $files $directoryecho "Done."exit