projects / unix-history / blame
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1 | .\" Copyright (c) 1989 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| 3 | .\" | |
| c0567266 KB |
4 | .\" Redistribution and use in source and binary forms, with or without |
| 5 | .\" modification, are permitted provided that the following conditions | |
| 6 | .\" are met: | |
| 7 | .\" 1. Redistributions of source code must retain the above copyright | |
| 8 | .\" notice, this list of conditions and the following disclaimer. | |
| 9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
| 10 | .\" notice, this list of conditions and the following disclaimer in the | |
| 11 | .\" documentation and/or other materials provided with the distribution. | |
| 12 | .\" 3. All advertising materials mentioning features or use of this software | |
| 13 | .\" must display the following acknowledgement: | |
| 14 | .\" This product includes software developed by the University of | |
| 15 | .\" California, Berkeley and its contributors. | |
| 16 | .\" 4. Neither the name of the University nor the names of its contributors | |
| 17 | .\" may be used to endorse or promote products derived from this software | |
| 18 | .\" without specific prior written permission. | |
| 19 | .\" | |
| 20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 30 | .\" SUCH DAMAGE. | |
| 77fed4b3 | 31 | .\" |
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32 | .\" @(#)caesar.6 5.3 (Berkeley) 11/11/90 |
| 33 | .\" | |
| 34 | .TH CAESAR 6 "November 11, 1990" | |
| 77fed4b3 TH |
35 | .UC 7 |
| 36 | .SH NAME | |
| 37 | caesar \- decrypt caesar cyphers | |
| 38 | .SH SYNOPSIS | |
| 39 | .B caesar | |
| 40 | [ | |
| 41 | .B rotation | |
| 42 | ] | |
| 43 | .SH DESCRIPTION | |
| 44 | The | |
| 45 | .I caesar | |
| 3f26f967 | 46 | utility attempts to decrypt caesar cyphers using English letter frequency |
| 77fed4b3 TH |
47 | statistics. |
| 48 | .I Caesar | |
| 49 | reads from the standard input and writes to the standard output. | |
| 50 | .PP | |
| 51 | The optional numerical argument | |
| 52 | .I rotation | |
| 53 | may be used to specify a specific rotation value. | |
| 3f26f967 KB |
54 | .PP |
| 55 | The frequency (from most common to least) of English letters is as follows: | |
| 56 | .sp | |
| 57 | .RS | |
| 58 | ETAONRISHDLFCMUGPYWBVKXJQZ | |
| 59 | .RE | |
| 60 | .PP | |
| 61 | Their frequencies as a percentage are as follows: | |
| 62 | .sp | |
| 63 | .RS | |
| 64 | 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), | |
| 65 | 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), | |
| 66 | W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13), Q(.11), Z(.07). | |
| 67 | .RE | |
| 68 | .PP | |
| 69 | Rotated postings to USENET and some of the databases used by the | |
| 70 | .IR fortune (6) | |
| 71 | program are rotated by 13 characters. |