xbmc batch script renamer

#!/bin/bash

ProcessOneFolder()
{
    folder=$1
    currentFolder=`pwd`
    cd "$folder"
    base=""
    full=""
    name=""

    for file in *.nfo; do
        nfo=".nfo"
        empty=""
        slash="/"
        and="&"
        singleQuote="'"
        singleQuoteReplaced="'"
        base=${file/$nfo/$empty}
        name=`cat "$file" | grep -i "<originaltitle>"`
        if [[ ! -n $name ]]
        then
            name=`cat "$file" | grep -i "<title>"`
        fi
        name=`echo $name | sed 's/<[^>]*[>]//g'`
        name="${name#"${name%%[![:space:]]*}"}"
        name="${name%"${name##*[![:space:]]}"}"
        name=${name// : / }
        name=${name// :/ }
        name=${name//: / }
        name=${name//:/ }
        name=${name//$and/And}
        name=${name//$singleQuote/$singleQuoteReplaced}
        name=${name//$slash/$empty}
        year=`cat "$file" | grep -i "<year>" | sed 's/<[^>]*[>]//g'`
        year=${year//[[:space:]]/}
        full="$name ($year)"
    done

    if [[ ! -n $name ]]
    then
        cd "$currentFolder"
        return 0
    fi

    for file in "${base}"*.*; do
        if [[ "$file" == *$base* ]]
        then
            newFile=${file/$base/$full}
            if [[ "$newFile" != "$file" ]]
            then
                mv "$file" "$newFile"
            fi
        fi
    done
    cd "$currentFolder"

    if [[ "$folder" != "$full" ]]
    then
        mv "$folder"  "$full"
    fi
}

FindFolderByFirstLetter()
{
    letter=$1
    for dir in ${letter}*; do
        ProcessOneFolder "$dir"
    done
}

Main()
{
    #ProcessOneFolder "A Knight' Tale (2001)"

    for letter in A B C D E F G H I J K L M N O P Q R S T U V W X Y Z;  do
        FindFolderByFirstLetter $letter
    done

}

Main