Batch Episode Renamer

#!/bin/bash
if [ "$1" == "" ]; then
    printf "Enter Season Name: "; read season
else
    season="$1"
fi

if [ "$2" == "" ]; then
    printf "Enter Season ID  : "; read id
else
    id="$2"
fi

episodeNum=1
for episode in *.mkv; do
   episodeName=$(printf "%s %sx%02d.mkv" "$season" "$id" "$episodeNum")
   mv -i -v "$episode" "$episodeName"
   let episodeNum+=1
done