new UNIX book

[Jack Campin]

I just spotted this in the local university bookshop:

    The Design of the UNIX Operating System
    Maurice J. Bach
    Prentice-Hall, ISBN 0 13 201799 7, costs a bundle.

Anyone out there read it yet?
Is it any good? 
Does it add much to what's in Comer's book?
-- 
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