Shift files in a naming scheme of "xx-yy" where xx is a number to create space at a given index

insert

#!/bin/bash

set -eu

new=$1

for file in $(ls | sort -g -r)
do
	filename=$(basename "$file")
	number=$(echo $filename | cut -d- -f1)
	after=$(printf "%s" "${filename#*-}")

	if [ $file = "index.mdx" ]; then
		continue
	fi

	if [ $number -ge $new ]; then
		mv "$file" "$(printf "%02d" "$(($number + 1))")-$after"
	fi
done