FACTOR(6) BSD Games Manual FACTOR(6)NAME
factor, primes — factor a number, generate primes
SYNOPSISfactor [-h] [number ...]
primes [-h] [start [stop]]
DESCRIPTION
The factor utility will factor positive integers. When a number is fac‐
tored, it is printed, followed by a ‘:’, and the list of 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
‘+’. Numbers are terminated by a non-digit character (such as a new‐
line). After a number is read, it is factored.
The primes utility prints primes in ascending order, one per line, start‐
ing 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 the maximum. The default and maximum value of
stop is 4294967295 on 32-bit architectures and 18446744073709551615 on
64-bit ones.
When the primes utility is invoked with no arguments, start is read from
standard input and stop is taken to be the maximum. The start value may
be preceded by a single ‘+’. The start value is terminated by a non-
digit character (such as a newline).
DIAGNOSTICS
negative numbers aren't permitted
illegal numeric format
start value must be less than stop value
Result too large
BUGSfactor cannot handle the “10 most wanted” factor list, primes will not
get you a world record.
BSD October 10, 2002 BSD
