about wave file integrating.

Now I have two wave file(.wav) at Tru64 Unix machine.
I want to make a new wave file including the two wave file.
how I should finish this programmer.
If you know, can you give me the format of the wave file(
.wav)
and Sun au file(*.au).
Thank you.

Perhaps this reference will help?

http://www.amazon.com/exec/obidos/ASIN/1565923537/qid=998275688/sr=1-11/ref=sc\_b_11/103-8200221-0019065/silkroadcom