Rename a file to its md5 checksum, keeping the extension

rename-to-md5.sh

#!/bin/bash
# renames all input files to their md5 checksum, keeping the extension.
# this can be used as a nemo script.
for each in "$@"; do
    NAME=$(basename "${each}")
    EXT="${NAME#*.}"
    DIR=$(dirname "${each}")
    MD5=($(md5sum "${each}"))
    mv "${each}" "${DIR}/${MD5}.${EXT}"
done