Make this compile with gcc40: rename variables so that they don't collide
[dragonfly.git] / games / caesar / caesar.6
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1.\" Copyright (c) 1989, 1991, 1993
2.\" The Regents of the University of California. All rights reserved.
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32.\" @(#)caesar.6 8.2 (Berkeley) 11/16/93
33.\" $FreeBSD: src/games/caesar/caesar.6,v 1.5.2.2 2001/03/05 18:10:21 ru Exp $
1de703da 34.\" $DragonFly: src/games/caesar/caesar.6,v 1.2 2003/06/17 04:25:23 dillon Exp $
984263bc
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35.\"
36.Dd November 16, 1993
37.Dt CAESAR 6
38.Os
39.Sh NAME
40.Nm caesar
41.Nd decrypt caesar ciphers
42.Sh SYNOPSIS
43.Nm
44.Op Ar rotation
45.Sh DESCRIPTION
46The
47.Nm
48utility attempts to decrypt caesar ciphers using English letter frequency
49statistics.
50.Nm Caesar
51reads from the standard input and writes to the standard output.
52.Pp
53The optional numerical argument
54.Ar rotation
55may be used to specify a specific rotation value.
56.Pp
57The frequency (from most common to least) of English letters is as follows:
58.Pp
59.Bd -ragged -offset indent
60ETAONRISHDLFCMUGPYWBVKXJQZ
61.Ed
62.Pp
63Their frequencies as a percentage are as follows:
64.Pp
65.Bd -ragged -offset indent
66E(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),
67D(3.8), L(3.4), F(2.9), C(2.7), M(2.5), U(2.4), G(2),
68P(1.9), Y(1.9),
69W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13), Q(.11), Z(.07).
70.Ed
71.Pp
72Rotated postings to
73.Tn USENET
74and some of the databases used by the
75.Xr fortune 6
76program are rotated by 13 characters.