rename files based on the filenames on a txt

do.sh

#!/bin/bash

set -e

cd '/home/user/work/videos'

readarray -t lines <'./filenames.txt'

rtrim() { sed -e 's/[[:space:]]*$//'; }
sanitize() { tr -cd '[:alnum:] .'; } # fat32 support

for ((i = 1; i <= ${#lines[@]}; i++)); do
	newfilename="$(printf '%03d.%s\n' "$i" "${lines[i - 1]}" | rtrim | sanitize)"
	sudo mv ${i}.mp4 "${newfilename}.mp4"
done