1.\" $NetBSD: factor.6,v 1.6 2001/04/02 22:42:38 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 51factor a number, generate primes 52.Sh SYNOPSIS 53.Nm 54.Op Ar number ... 55.br 56.Nm primes 57.Op Ar start Op Ar stop 58.Sh DESCRIPTION 59The 60.Nm 61utility will factor integers between -2147483648 and 2147483647 inclusive. 62When a number is factored, it is printed, followed by a 63.Dq \: , 64and the list of factors on a single line. 65Factors are listed in ascending order, and are preceded by a space. 66If a factor divides a value more than once, it will be printed 67more than once. 68.Pp 69When 70.Nm 71is invoked with one or more arguments, 72each argument will be factored. 73.Pp 74When 75.Nm 76is invoked with no arguments, 77.Nm 78reads numbers, one per line, from standard input, until end of file or error. 79Leading white-space and empty lines are ignored. 80Numbers may be preceded by a single - or +. 81Numbers are terminated by a non-digit character (such as a newline). 82After a number is read, it is factored. 83Input lines must not be longer than 255 characters. 84.Pp 85The 86.Nm primes 87utility prints primes in ascending order, one per line, starting at or above 88.Ar start 89and continuing until, but not including 90.Ar stop . 91The 92.Ar start 93value must be at least 0 and not greater than 94.Ar stop . 95The 96.Ar stop 97value must not be greater than 4294967295. 98The default value of 99.Ar stop 100is 4294967295. 101.Pp 102When the 103.Nm primes 104utility is invoked with no arguments, 105.Ar start 106is read from standard input. 107.Ar stop 108is taken to be 4294967295. 109The 110.Ar start 111value may be preceded by a single +. 112The 113.Ar start 114value is terminated by a non-digit character (such as a newline). 115The input line must not be longer than 255 characters. 116.Sh DIAGNOSTICS 117Out of range or invalid input results in 118.Sq ouch 119being written to standard error. 120.Sh BUGS 121.Nm 122cannot handle the 123.Dq 10 most wanted 124factor list, 125.Nm primes 126won't get you a world record. 127