This is an excellent overview of various obsolete mainframe operating systems (not to mention Unix, which is not obsolete.) You know the systems I mean: the ones you access using those ugly old green and black screens in a dusty corner of your IT department's offices, the ones with the humongous databases hidden behind arcane text-based software. The potentially dry material is greatly moistened by DuCharme's witty yet...
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If you want to have a good overview of all the major mini/mainframe OSes, this is the book. The absence of NT and the inclusion of VM is questionable but this could be addressed by a 2nd edition. If you are looking for an in-depth discussion of the internals of each system this is not your book. But if you need to navigate multiple OSes in a multiplatform environment this is your best bet.
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