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The optional numerical argument rotation may be used to specify a specific rotation value. If invoked as rot13, a rotation value of 13 will be used.
The frequency (from most common to least) of English letters is as follows: ETAONRISHDLFCMUGPYWBVKXJQZ
Their frequencies as a percentage are as follows: E(13), T(10.5), A(8.1), O(7.9), N(7.1), R(6.8), I(6.3), S(6.1), H(5.2), D(3.8), L(3.4), F(2.9), C(2.7), M(2.5), U(2.4), G(2), P(1.9), Y(1.9), W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13), Q(.11), Z(.07).
Rotated postings to USENET and some of the databases used by the fortune(6) program are rotated by 13 characters.
| CAESAR (6) | November 16, 1993 |
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| “ | "I liken starting one's computing career with Unix, say as an undergraduate, to being born in East Africa. It is intolerably hot, your body is covered with lice and flies, you are malnourished and you suffer from numerous curable diseases. But, as far as young East Africans can tell, this is simply the natural condition and they live within it. By the time they find out differently, it is too late. They already think that the writing of shell scripts is a natural act." | ” |
| — Ken Pier, Xerox PARC | ||