factor/factor.6

   1 .\"     $NetBSD: factor.6,v 1.5 1997/10/10 12:51:27 lukem Exp $
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   3 .\" Copyright (c) 1989, 1993
   4 .\"     The Regents of the University of California.  All rights reserved.
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   6 .\" This code is derived from software contributed to Berkeley by
   7 .\" Landon Curt Noll.
   8 .\"
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  19 .\"     This product includes software developed by the University of
  20 .\"     California, Berkeley and its contributors.
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  25 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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  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
  51 factor 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
  59 The
  60 .Nm
  61 utility will factor integers between -2147483648 and 2147483647 inclusive.
  62 When a number is factored, it is printed, followed by a
  63 .Dq \: ,
  64 and the list of factors on a single line.
  65 Factors are listed in ascending order, and are preceded by a space.
  66 If a factor divides a value more than once, it will be printed
  67 more than once.
  68 .Pp
  69 When
  70 .Nm
  71 is invoked with one or more arguments,
  72 each argument will be factored.
  73 .Pp
  74 When
  75 .Nm
  76 is invoked with no arguments,
  77 .Nm
  78 reads numbers, one per line, from standard input, until end of file or error.
  79 Leading white-space and empty lines are ignored.
  80 Numbers may be preceded by a single - or +.
  81 Numbers are terminated by a non-digit character (such as a newline).
  82 After a number is read, it is factored.
  83 Input lines must not be longer than 255 characters.
  84 .Pp
  85 The
  86 .Nm primes
  87 utility prints primes in ascending order, one per line, starting at or above
  88 .Ar start
  89 and continuing until, but not including
  90 .Ar stop .
  91 The
  92 .Ar start
  93 value must be at least 0 and not greater than
  94 .Ar stop .
  95 The
  96 .Ar stop
  97 value must not be greater than 4294967295.
  98 The default value of
  99 .Ar stop
 100 is 4294967295.
 101 .Pp
 102 When the
 103 .Nm primes
 104 utility is invoked with no arguments,
 105 .Ar start
 106 is read from standard input.
 107 .Ar stop
 108 is taken to be 4294967295.
 109 The
 110 .Ar start
 111 value may be preceded by a single +.
 112 The
 113 .Ar start
 114 value is terminated by a non-digit character (such as a newline).
 115 The input line must not be longer than 255 characters.
 116 .Sh DIAGNOSTICS
 117 Out of range or invalid input results in
 118 .Sq ouch
 119 being written to standard error.
 120 .Sh BUGS
 121 .Nm
 122 cannot handle the
 123 .Dq 10 most wanted
 124 factor list,
 125 .Nm primes
 126 won't get you a world record.