NAME
factor, primes
— factor a number, generate
primes
SYNOPSIS
factor |
[number ...] |
primes |
[start [stop]] |
DESCRIPTION
The factor utility will factor 64-bit
positive integers. When a number is factored, it is printed, followed by a
‘:’, and the list of its prime factors in ascending order, on
a single line. Every prime factor is printed as often as it divides the
number.
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. White-space and empty lines are ignored.
Numbers may be preceded by a single +. After a number is read, it is
factored. Input lines must not be longer than 99 characters.
The primes utility prints primes in
ascending order, one per line, starting at or above
start and continuing until, but not including
stop. The start value must be at
least 0 and not greater than stop. The
stop value must not be greater than 4294967295. The
default value of stop is 4294967295.
When the primes utility is invoked with no
arguments, start is read from standard input.
stop is taken to be 4294967295. The
start value may be preceded by a single +. The input
line must not be longer than 99 characters.
BUGS
factor cannot handle the “10 most
wanted” factor list; primes won't get you a
world record.