After connecting card/USB storage to mac, lot of extra hidden files are generated ... this is a way to remove them

remove_all_mac_meta_files.sh

#!/bin/bash

volume="/Volumes/CANON_DC"

# disable indexing
sudo mdutil -v -i off ${volume}

# remove index
sudo mdutil -v -X ${volume}

# remove all mac extra files (verbose)
dot_clean -v ${volume}