Ubuntu merge mp3 files

concatenate mp3 files

$ sudo apt-get install id3 mp3wrap ffmpeg
$ mp3wrap mp3-big.mp3 1.mp3 2.mp3 3.mp3 4.mp3
$ ffmpeg -i mp3-big_MP3WRAP.mp3 -acodec copy mp3-big.mp3 && rm mp3-big_MP3WRAP.mp3
$ id3cp 1.mp3 mp3-big.mp3