factor man page on 4.4BSD

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FACTOR(6)							     FACTOR(6)

       factor, primes - factor a number, generate primes

       factor [ 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
       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.

       Out  of range or invalid input results in `ouch' being written to stan‐
       dard error.

       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)

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