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FACTOR(6)              BSD Reference Manual             FACTOR(6)


NAME
       factor, primes - factor a number, generate primes

SYNOPSIS
       factor [ number ] ...

       primes [ start [ stop ]]

DESCRIPTION
       The   factor   utility   will   factor   integers  between
       -2147483648 and 2147483647 inclusive.  When  a  number  is
       factored, 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 - 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.

DIAGNOSTICS
       Out of range or invalid  input  results  in  `ouch'  being
       written to standard error.

BUGS
       Factor  cannot  handle the ``10 most wanted'' factor list,
       primes won't get you a world record.





4.4 Berkeley Distribution  May 31, 1993                         1