linux下以16进制方式查看文件

最近有个需求是从MP3文件中提取cover，怎么提取，后续会专门写篇文章，所以需要研究MP3文件样本，这个时候得看MP3文件的数据格式，我知道UltraEdit是可以看的，可惜这个是要花钱买的，在网上找了几个序列号，也不好使。后来在网上查了下，用xxd在linux
下就可以看；

xxd
-g 1 -c 16  a.mp3

0000000: 49 44 33 04 00 00 00 00 08 43 54 49 54 32 00 00 ID3......CTIT2..
0000010: 00 0d 00 00 01 ff fe 11 62 8c 54 0a 4e 98 5b d5 ........b.T.N.[.
0000020: 71 54 50 45 31 00 00 00 07 00 00 01 ff fe 75 8d qTPE1.........u.
0000030: 87 85 54 41 4c 42 00 00 00 11 00 00 01 ff fe 44 ..TALB.........D
0000040: 00 6f 00 75 00 62 00 6c 00 65 00 cc 53 00 00 00 .o.u.b.l.e..S...
0000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................效果是不是和UltraEdit一样呢？
-g 1  ：代表一组1个字节，你可以自由配置

-c  16 :代表一行显示多少列，这里是16列，模仿UltraEdit来的。