FACTOR(6) | Games Manual | FACTOR(6) |
factor
— factor a
number
factor |
[-hx ] [number ...] |
The factor
utility factors integers larger
than 0
. 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. By
default, if a factor divides a value more than once, it will be printed more
than once.
When factor
is invoked with one or more
number arguments, each argument will be factored.
When factor
is invoked with no
number 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 +. Numbers that start with 0x
are
interpreted as hexadecimal. A 0
input exits the
program. Negative numbers are not allowed. 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.
The following option is available:
Out of range or invalid input results in an appropriate error message to standard error.
Originally by Landon Curt Noll.
October 12, 2020 | NetBSD 10.99 |