#!/bin/bash

for file in *.torrent;

do

        #this below works but matches all letters and removes them all

        #mv "$file" "$(echo $file | sed -e 's/[kat.cr]//g')"

        #This one works well but only removes all 7 chars at the beginning of te file

        mv "$file" "${file:8}"; #used to remove [kat.cr]

done