# factor(6) [netbsd man page]

FACTOR(6) BSD Games Manual FACTOR(6)NAME

factorfactor a number--SYNOPSIS

factor [number ...]DESCRIPTION

The factor utility factors integers larger than 1. When a number is factored, it is printed, followed by a ``:'', and the list of (prime) factors on a single line. Factors are listed in ascending order, and are preceded by a space. If a factor divides a value more than once, it will be printed more than once. When factor is invoked with one or more arguments, each argument will be factored. When factor is invoked with no arguments, factor reads numbers, one per line, from standard input, until end of file or error. Leading white-space and empty lines are ignored. Numbers may be preceded by a single +. Integer less than 2 are rejected. Numbers are terminated by a non-digit character (such as a newline). After a number is read, it is factored. Input lines must not be longer than LINE_MAX - 1 (currently 2047) characters. By default, factor is compiled against the OpenSSL bignum implementation openssl_bn(3), which lets it handle arbitrarily large values. (Note however that very large values can take a very long time to factor.) If factor is compiled without OpenSSL it is limited to the maximum value of unsigned long.DIAGNOSTICS

Out of range or invalid input results in an appropriate error message being written to standard error.BSD

May 15, 2010 BSD

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factor(1) User Commands factor(1)NAME

factor - obtain the prime factors of a numberSYNOPSIS

factor [integer]DESCRIPTION

factor writes to standard input all prime factors for any positive integer less than or equal to 10**14. The prime factors are written the proper number of times. If factor is used without an argument, it waits for an integer to be entered. After entry of the integer, it factors it, writes its prime factors the proper number of times, and then waits for another integer. factor exits if a 0 or any non-numeric character is entered. If factor is invoked with an argument (integer), it writes the integer, factors it and writes all the prime factors as described above, and then exits. If the argument is 0 or non-numeric, factor writes a 0 and then exits. The maximum time to factor an integer is proportional to sqrt(n), where n is the integer which is entered. factor will take this time when n is prime or the square of a prime.OPERANDS

integer Any positive integer less than or equal to 10**14.EXIT STATUS

0 Successful completion. 1 An error occurred.DIAGNOSTICS

factor prints the error message Ouch! for input out of range or for garbage input.ATTRIBUTES

See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+SEE ALSO

attributes(5)SunOS 5.1031 Jan 1996 factor(1)