Copy media files and create directory if necessary

copy_files.sh

#!/usr/bin/env bash

shopt -s globstar
numberRegex='^[0-9]+$'
for d in static/* static/**/* ; do
        if [ -d ${d} ]; then
                bn=$(basename $d)
                # We only care about media resources
                if [[ "$bn" = "images"  || ("$bn" = "videos"  || "$bn" = "sounds") ]]; then
                        for filepath in $(ls $d) ; do
                                mediaId="${filepath%.*}"
                                if ! [[ $mediaId =~ $numberRegex ]] ; then
                                        mediaDir="/media/$mediaId"
                                        # create directory if it doesn't exist
                                        if [ ! -d "$mediaDir" ]; then
                                                mkdir "$mediaDir"
                                        fi
                                        # copy file
                                        cp "$d/$filepath" "$mediaDir/$filepath"
                                fi
                        done
                fi
        fi
done