Shuffle files in a folder, for example musics.

shuffle_file.sh

#!/bin/bash

shuffle () {
	if [ -d $1 ]; then
		local folder=${1%/}
		read -p "Do you really want to shuffle folder: $folder? (yes/no) > "
		if [ $REPLY == "no" ]; then
			exit 1
		elif [ $REPLY != "yes" ]; then
			echo "Invalid entry." >&2
			exit 1
		fi
		local files=$(ls $1)
		while read -r fname; do
			if [ -f "${folder}/${fname}" ] && [[ $fname == *.* ]]; then
				while true; do
					local new_name=$RANDOM.${fname##*.}
					if [ -f "${folder}/${new_name}" ]; then
						# duplicate file name
						continue
					fi
					mv "${folder}/${fname}" "${folder}/${new_name}"
					echo "${fname} -> ${new_name}"
					break
				done
			fi
		done <<<"$files"
	else
		echo "$(basename $0): $1: No such directory" >&2
		exit 1
	fi
}

shuffle "$@"

cool!