1.\" $NetBSD: factor.6,v 1.7 2002/09/26 18:32:01 wiz Exp $ 2.\" 3.\" Copyright (c) 1989, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Landon Curt Noll. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 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. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the University of 20.\" California, Berkeley and its contributors. 21.\" 4. Neither the name of the University nor the names of its contributors 22.\" may be used to endorse or promote products derived from this software 23.\" without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35.\" SUCH DAMAGE. 36.\" 37.\" @(#)factor.6 8.1 (Berkeley) 5/31/93 38.\" 39.\" 40.\" By: Landon Curt Noll chongo@toad.com, ...!{sun,tolsoft}!hoptoad!chongo 41.\" 42.\" chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\ 43.\" 44.Dd May 31, 1993 45.Dt FACTOR 6 46.Os 47.Sh NAME 48.Nm factor , 49.Nm primes 50.Nd factor a number, generate primes 51.Sh SYNOPSIS 52.Nm 53.Op Ar number ... 54.br 55.Nm primes 56.Op Ar start Op Ar stop 57.Sh DESCRIPTION 58The 59.Nm 60utility will factor integers between \-2147483648 and 2147483647 inclusive. 61When a number is factored, it is printed, followed by a 62.Dq \&: , 63and the list of factors on a single line. 64Factors are listed in ascending order, and are preceded by a space. 65If a factor divides a value more than once, it will be printed more than once. 66.Pp 67When 68.Nm 69is invoked with one or more arguments, each argument will be factored. 70.Pp 71When 72.Nm 73is invoked with no arguments, 74.Nm 75reads numbers, one per line, from standard input, until end of file or error. 76Leading white-space and empty lines are ignored. 77Numbers may be preceded by a single - or +. 78Numbers are terminated by a non-digit character (such as a newline). 79After a number is read, it is factored. 80Input lines must not be longer than 255 characters. 81.Pp 82The 83.Nm primes 84utility prints primes in ascending order, one per line, starting at or above 85.Ar start 86and continuing until, but not including 87.Ar stop . 88The 89.Ar start 90value must be at least 0 and not greater than 91.Ar stop . 92The 93.Ar stop 94value must not be greater than 4294967295. 95The default value of 96.Ar stop 97is 4294967295. 98.Pp 99When the 100.Nm primes 101utility is invoked with no arguments, 102.Ar start 103is read from standard input. 104.Ar stop 105is taken to be 4294967295. 106The 107.Ar start 108value may be preceded by a single +. 109The 110.Ar start 111value is terminated by a non-digit character (such as a newline). 112The input line must not be longer than 255 characters. 113.Sh DIAGNOSTICS 114Out of range or invalid input results in 115.Sq ouch 116being written to standard error. 117.Sh BUGS 118.Nm 119cannot handle the 120.Dq 10 most wanted 121factor list, 122.Nm primes 123won't get you a world record. 124