How to split album into different flac and tag them under Gentoo Linux

# mac to support ape
sudo USE="alac flac mac shorten sox wavpack" emerge media-sound/shntool
sudo emerge cuetools

#!/bin/bash
# split image file (flac, ape, wav, etc.) according to cue-file
if [ -f "$1" ]; then
    i=0
    for cuefile in *.cue; do
        i=$(($i + 1))
    done
    if [ $i -eq 1 ]; then
        # precies 1 cuesheet gevonden
        if grep -q "INDEX 01 00:00:00" *.cue ; then
            nice shntool split -t "%n %t" -f *.cue "$1"
        else
            echo "The first track has a pre-gap. Shntool will cut that off and put it in a seperate file."
            echo "You don't want that. Please modify the cuesheet from:"
            grep -m1 "INDEX 00" *.cue
            grep -m1 "INDEX 01" *.cue
            echo "to:"
            echo "    INDEX 01 00:00:00"
            exit 1
        fi
    elif [ $i -eq 0 ]; then
        echo "No cuesheet found in the current directory."
        exit 1
    elif [ $i -gt 1 ]; then
        echo "$i cuesheets found in the current directory. Please remove the superfluous cuesheets."
        exit 1
    fi
else
    echo "Split image file (flac, ape, wav, etc.) according to cue-file."
    echo "Output files are in FLAC."
    echo "Usage: `basename $0` <image-file>"
    exit 1
fi

echo
album=`grep -m 1 TITLE *.cue | cut -d\" -f2`
artist=`grep -m 1 PERFORMER *.cue | cut -d\" -f2`

for file in [0-9]*.wav; do
    echo "Encoding $file"

    if [[ ${file:0:1} == 0 ]] ; then
        tracknr=${file:1:1}
    else
        tracknr=${file:0:2}
    fi
    title=`echo ${file:2} | sed -e "s/.wav$//"`

    nice flac -s -T "artist=$artist" -T "album=$album" -T "title=$title" \
    -T "tracknumber=$tracknr" "$file" && rm "$file"
done

# convert the ape to corresponding wav file, for example, "a.ape" is converted to "a.ape.wav"
find . -name '*.ape'|xargs -I {} ffmpeg -i {} {}.wav
# split wav and convert it to flac, make sure the *.cue exists in current directory
cue2flac a.ape.wav
# do the cleaning (OPTIONAL)
rm *.ape *.wav