factor, primes - factor a number, generate primes
SYNOPSISfactor [ number ] ...
primes [ start [ stop ]]
The factor utility will factor integers between -2147483648 and
2147483647 inclusive. When a number is factored, it is printed, fol‐
lowed 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 fac‐
tor 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
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
- or +. 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 255 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 start value is terminated by a non-
digit character (such as a newline). The input line must not be longer
than 255 characters.
Out of range or invalid input results in `ouch' being written to stan‐
Factor cannot handle the ``10 most wanted'' factor list, primes won't
get you a world record.
4.4 Berkeley Distribution May 31, 1993 FACTOR(6)