1 .\" $NetBSD: factor.6,v 1.12 2010/05/15 21:22:39 joerg Exp $
3 .\" Copyright (c) 1989, 1993
4 .\" The Regents of the University of California. All rights reserved.
6 .\" This code is derived from software contributed to Berkeley by
9 .\" Redistribution and use in source and binary forms, with or without
10 .\" modification, are permitted provided that the following conditions
12 .\" 1. Redistributions of source code must retain the above copyright
13 .\" notice, this list of conditions and the following disclaimer.
14 .\" 2. Redistributions in binary form must reproduce the above copyright
15 .\" notice, this list of conditions and the following disclaimer in the
16 .\" documentation and/or other materials provided with the distribution.
17 .\" 3. Neither the name of the University nor the names of its contributors
18 .\" may be used to endorse or promote products derived from this software
19 .\" without specific prior written permission.
21 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 .\" @(#)factor.6 8.1 (Berkeley) 5/31/93
36 .\" By: Landon Curt Noll chongo@toad.com, ...!{sun,tolsoft}!hoptoad!chongo
38 .\" chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\
52 utility factors integers larger than 1.
53 When a number is factored, it is printed, followed by a
57 factors on a single line.
58 Factors are listed in ascending order, and are preceded by a space.
59 If a factor divides a value more than once, it will be printed more than once.
63 is invoked with one or more arguments, each argument will be factored.
67 is invoked with no arguments,
69 reads numbers, one per line, from standard input, until end of file or error.
70 Leading white-space and empty lines are ignored.
71 Numbers may be preceded by a single +.
72 Integer less than 2 are rejected.
73 Numbers are terminated by a non-digit character (such as a newline).
74 After a number is read, it is factored.
75 Input lines must not be longer than
77 (currently 2047) characters.
81 is compiled against the OpenSSL bignum implementation
83 which lets it handle arbitrarily large values.
84 .Pq Note however that very large values can take a very long time to factor.
87 is compiled without OpenSSL it is limited to the maximum value of
90 Out of range or invalid input results in
91 an appropriate error message
92 being written to standard error.