FACTOR(6) BSD Reference Manual FACTOR(6)
factor, primes - factor a number, generate primes
S
\bSY
\bYN
\bNO
\bOP
\bPS
\bSI
\bIS
\bS
f
\bfa
\bac
\bct
\bto
\bor
\br [ number ] ...
p
\bpr
\bri
\bim
\bme
\bes
\bs [ start [ stop ]]
D
\bDE
\bES
\bSC
\bCR
\bRI
\bIP
\bPT
\bTI
\bIO
\bON
\bN
The _
\bf_
\ba_
\bc_
\bt_
\bo_
\br 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
When _
\bf_
\ba_
\bc_
\bt_
\bo_
\br is invoked with one or more arguments, each
argument will be factored.
When _
\bf_
\ba_
\bc_
\bt_
\bo_
\br is invoked with no arguments, _
\bf_
\ba_
\bc_
\bt_
\bo_
\br 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 _
\bp_
\br_
\bi_
\bm_
\be_
\bs utility prints primes in ascending order, one
per line, starting at or above s
\bst
\bta
\bar
\brt
\bt and continuing until,
but not including s
\bst
\bto
\bop
\bp.
\b. The s
\bst
\bta
\bar
\brt
\bt value must be at least
0 and not greater than s
\bst
\bto
\bop
\bp.
\b. The s
\bst
\bto
\bop
\bp value must not be
greater than 4294967295. The default value of s
\bst
\bto
\bop
\bp is
When the _
\bp_
\br_
\bi_
\bm_
\be_
\bs utility is invoked with no arguments,
s
\bst
\bta
\bar
\brt
\bt is read from standard input. S
\bSt
\bto
\bop
\bp is taken to be
4294967295. The s
\bst
\bta
\bar
\brt
\bt value may be preceded by a single
+. The s
\bst
\bta
\bar
\brt
\bt value is terminated by a non-digit character
(such as a newline). The input line must not be longer
D
\bDI
\bIA
\bAG
\bGN
\bNO
\bOS
\bST
\bTI
\bIC
\bCS
\bS
Out of range or invalid input results in `ouch' being
written to standard error.
_
\bF_
\ba_
\bc_
\bt_
\bo_
\br cannot handle the ``10 most wanted'' factor list,
_
\bp_
\br_
\bi_
\bm_
\be_
\bs won't get you a world record.
4.4 Berkeley Distribution May 31, 1993 1