flac tracks > cue

 $cuebreakpoints file.cue | shnsplit -o flac file.flac[br]
$cuetag file.cue split-track*.flac 

shntool join *.flac

shncue -sc *
FILE "joined.wav" WAVE
  TRACK 01 AUDIO
    INDEX 01 0:00:00
  TRACK 02 AUDIO
    INDEX 01 9:13:36
  TRACK 03 AUDIO
    INDEX 01 17:44:09
  TRACK 04 AUDIO
    INDEX 01 22:59:47
  TRACK 05 AUDIO
    INDEX 01 30:11:66
  TRACK 06 AUDIO
    INDEX 01 37:38:01
  TRACK 07 AUDIO
    INDEX 01 42:20:22
  TRACK 08 AUDIO
    INDEX 01 52:02:13
  TRACK 09 AUDIO
    INDEX 01 60:09:63
  TRACK 10 AUDIO
    INDEX 01 67:11:26

$ls -C1 *.flac > filelist
$shntool cue -F filelist > joined.cue
$shntool join -F filelist -o flac

metaflac --show-tag=title *
metaflac --show-tag=date *
metaflac --show-tag=artist *
metaflac --show-tag=album *
metaflac --show-tag=genre *

#!/bin/bash

# File : mergeflacs
# (c) Alexander Sokolov sokoloff.a@gmail.com
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# Ver. 0.1


OUT_FORMAT='flac'
CUE_FILE="joined.cue"
TMP_CUE_FILE="tmp.cue"

firstFile=$1
IFS="\n"

function help {
    echo "Usage: mergeflacs file1 file2 [file3 ...]"
    echo "Joins multiple FLAC files into one, and create CUE file with tags."
}

function flacTag {
    tag=$1
    flacFile=$2
    metaflac --show-tag="$1" $2 | awk '{split($0,a,"="); print a[2]}'
}

if [ -z "$1" ]; then
    echo "error: need two or more files to process."
    help
    exit 1
fi

shntool join -o ${OUT_FORMAT} -O always  $@
shntool cue  $@ > "$TMP_CUE_FILE"

# Create CUE file .........................................
echo -n > "$CUE_FILE"

val=`flacTag GENRE "$firstFile"`
[  -n "$val" ] && echo "REM GENRE \"$val\"" >> "$CUE_FILE"

val=`flacTag DATE "$firstFile"`
[  -n "$val" ] && echo "REM DATE \"$val\"" >> "$CUE_FILE"

val=`flacTag ALBUM "$firstFile"`
[  -n "$val" ] && echo "TITLE \"$val\"" >> "$CUE_FILE"

grep "FILE.*WAVE"  "$TMP_CUE_FILE" >> "$CUE_FILE"

n=0
for f in "$@"; do
    n=$((n+1))
    index=`printf %02d $n`

    echo "  TRACK $index AUDIO" >> "$CUE_FILE"
    grep -A1 "TRACK $index"  "$TMP_CUE_FILE" | grep -v "TRACK" >> "$CUE_FILE"

    val=`flacTag ARTIST "$f"`
    [  -n "$val" ] && echo "    PERFORMER \"$val\"" >> "$CUE_FILE"

    val=`flacTag TITLE "$f"`
    [  -n "$val" ] && echo "    TITLE \"$val\"" >> "$CUE_FILE"
    
done;