projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b9569f43 KB |
1 | .\" Copyright (c) 1989, 1993 |
| 2 | .\" The Regents of the University of California. All rights reserved. | |
| bc2e2efb KB |
3 | .\" |
| 4 | .\" This code is derived from software contributed to Berkeley by | |
| 5 | .\" Landon Curt Noll. | |
| 6 | .\" | |
| 91cff1e1 | 7 | .\" %sccs.include.redist.man% |
| bc2e2efb | 8 | .\" |
| b9569f43 | 9 | .\" @(#)factor.6 8.1 (Berkeley) %G% |
| bc2e2efb KB |
10 | .\" |
| 11 | .\" | |
| 12 | .\" By: Landon Curt Noll chongo@toad.com, ...!{sun,tolsoft}!hoptoad!chongo | |
| 13 | .\" | |
| 14 | .\" chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\ | |
| 15 | .\" | |
| 16 | .TH FACTOR 6 "" | |
| 17 | .UC 7 | |
| 18ee5c99 | 18 | .SH NAME |
| bc2e2efb | 19 | factor, primes \- factor a number, generate primes |
| 18ee5c99 KB |
20 | .SH SYNOPSIS |
| 21 | .B factor | |
| bc2e2efb | 22 | [ number ] ... |
| 18ee5c99 KB |
23 | .PP |
| 24 | .B primes | |
| bc2e2efb | 25 | [ start [ stop ]] |
| 18ee5c99 | 26 | .SH DESCRIPTION |
| bc2e2efb KB |
27 | The |
| 28 | .I factor | |
| 29 | utility will factor integers between -2147483648 and 2147483647 inclusive. | |
| 30 | When a number is factored, it is printed, followed by a ``:'', | |
| 31 | and the list of factors on a single line. | |
| 32 | Factors are listed in ascending order, and are preceded by a space. | |
| 33 | If a factor divides a value more than once, it will be printed | |
| 34 | more than once. | |
| 35 | .PP | |
| 18ee5c99 KB |
36 | When |
| 37 | .I factor | |
| bc2e2efb KB |
38 | is invoked with one or more arguments, |
| 39 | each argument will be factored. | |
| 18ee5c99 | 40 | .PP |
| bc2e2efb KB |
41 | When |
| 42 | .I factor | |
| 43 | is invoked with no arguments, | |
| 18ee5c99 | 44 | .I factor |
| bc2e2efb KB |
45 | reads numbers, one per line, from standard input, until end of file or error. |
| 46 | Leading white-space and empty lines are ignored. | |
| 47 | Numbers may be preceded by a single - or +. | |
| 48 | Numbers are terminated by a non-digit character (such as a newline). | |
| 49 | After a number is read, it is factored. | |
| 50 | Input lines must not be longer than 255 characters. | |
| 18ee5c99 | 51 | .PP |
| bc2e2efb KB |
52 | The |
| 53 | .I primes | |
| 54 | utility prints primes in ascending order, one per line, starting at or above | |
| 55 | .B start | |
| 56 | and continuing until, but not including | |
| 57 | .B stop. | |
| 58 | The | |
| 59 | .B start | |
| 60 | value must be at least 0 and not greater than | |
| 61 | .B stop.\& | |
| 62 | The | |
| 63 | .B stop | |
| 64 | value must not be greater than 4294967295. | |
| 65 | The default value of | |
| 66 | .B stop | |
| 67 | is 4294967295. | |
| 18ee5c99 | 68 | .PP |
| bc2e2efb | 69 | When the |
| 18ee5c99 | 70 | .I primes |
| bc2e2efb KB |
71 | utility is invoked with no arguments, |
| 72 | .B start | |
| 73 | is read from standard input. | |
| 74 | .B Stop | |
| 75 | is taken to be 4294967295. | |
| 76 | The | |
| 77 | .B start | |
| 78 | value may be preceded by a single +. | |
| 79 | The | |
| 80 | .B start | |
| 81 | value is terminated by a non-digit character (such as a newline). | |
| 82 | The input line must not be longer than 255 characters. | |
| 18ee5c99 | 83 | .SH DIAGNOSTICS |
| bc2e2efb KB |
84 | Out of range or invalid input results in `ouch' being |
| 85 | written to standard error. | |
| 86 | .SH BUGS | |
| 87 | .I Factor | |
| 88 | cannot handle the ``10 most wanted'' factor list, | |
| 89 | .I primes | |
| 90 | won't get you a world record. |