BSD 4_4_Lite2 development

[unix-history] / usr / share / man / cat6 / rot13.0

CAESAR(6)                    BSD Reference Manual                    CAESAR(6)

N\bNA\bAM\bME\bE
     c\bca\bae\bes\bsa\bar\br - decrypt caesar cyphers

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
     c\bca\bae\bes\bsa\bar\br [_\br_\bo_\bt_\ba_\bt_\bi_\bo_\bn]

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     The c\bca\bae\bes\bsa\bar\br utility attempts to decrypt caesar cyphers using English let-
     ter frequency statistics.  C\bCa\bae\bes\bsa\bar\br reads from the standard input and
     writes to the standard output.

     The optional numerical argument Ar rotation may be used to specify a spe-
     cific rotation value.

     The frequency (from most common to least) of English letters is as fol-
     lows:

           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 for-
     tune(6) program are rotated by 13 characters.

4.4BSD                         November 16, 1993                             1