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If you think that fetchmail is the best program ever written and DK's knowledge and intellect is at the same level as ESR then you deserve this book.

OK, so you don't think much of ESR. Any alternative recommendations in the same topic area?

Kernighan and Pike, The UNIX Programming Environment.

(I consider ESR's book worthwhile too, and it's less outdated. But K&P is the purest expression I've seen of how to Unix.)

Who is DK?

Very likely, Donald Knuth. ESR's title is suggestive of Knuth's http://en.wikipedia.org/wiki/The_Art_of_Computer_Programming.

Should be DEK, not DK.