Unix/Linux - hexdump

Permits to show the hex version of first bytes of a file (-n limits the number of bytes):
 hexdump -n 30 20160929_result.hyp.matrix
0000000 0400 0000 0800 803f 0000 803f 0000 8542
0000010 9a99 8542 d7a3 3d41 14ae 3b41 b81e