Delete unused files in a static website

delete_unused_files.sh

#!/usr/bin/env bash

TEMP="./tmp"

REGEX="img\/[^>]+?(\"|\)|'| )"
ROOTPATH="./public"
PATH_TO_CLEAN="./public/img"


egrep -iowhr "$REGEX" * | rev | cut -c 2-1000 | rev | xargs -I {} sh -c "mkdir -p $TEMP/{} && rm -r $TEMP/{} && cp $ROOTPATH/{} $TEMP/{}"

rm $TEMP/{}
find $TEMP -type d -empty -delete

rm -rf $PATH_TO_CLEAN
mkdir $PATH_TO_CLEAN
cp -R $TEMP/ $ROOTPATH
rm -rf $TEMP