any good UNIX books out there?

[Daniel Wu]

I'd like to learn more about UNIX, so I'm interested in any good books that 
are at the "intermediate" level.  2 which I have heard about are 

	Advanced UNIX Programming,	Marc Rochkind
	UNIX System Programming,	K. Haviland & B. Salawa (?)

I went to my local bookstore, but they were out of both.  I'll have to special
order them.  Anyone out there familiar in these two?  I'd rather not buy
both, so if one is demonstratively better than the other (in terms of 
readability, style, and presentation of material, plus lots of examples) I'd 
purchase that one.

The topics that I'm particularly interested in are:

	Sys V IPC:	message queues, named pipes, shared memory,
	semaphores, record&file-locking 
	
	terminal devices, pty's

Can anyone recommend one or the other, or are there any other good books?

Daniel Wu
dwu at castor.usc.edu