perl -e 'sysread(STDIN, $r, 4); print unpack("L", $r)."\n"' < /dev/random
prints a random number between 0 and 2^32-1
replace the 4 and L to get different ranges:
2, S gives 0 to 65535
1, C gives 0 to 255
On Sat, Apr 28, 2001 at 12:46:58PM +0100, kevin lyda wrote:
> On Sat, Apr 28, 2001 at 11:34:18AM +0100, Conor Daly wrote:
> > Errm, so, how do I get numbers form /dev/random? dd gives me ascii
> > garbage, so does cat. Do I need to write a c proggie to read and what
> > should I read then?
>> an ugly pipeline:
>> dd if=/dev/urandom bs=10 count=1 2> /dev/null| od -x | sed 's/^[^ ]* *//'
>> play with flags to od to change the radix, change the bs= setting for dd
> to get different sized numbers. oh, and i used /dev/urandom to generate
> the numbers as it always returns the amount requested (at the price of
> less randomness).
>kevin at suberic.net CERT CA-96.13/NiftyGreenShield: ... Impact:
> fork()'ed on 37058400 Non-privileged primitive users can cause the
> meatspace place: home total destruction of your entire invasion fleet
>http://suberic.net/~kevin and gain unauthorized access to files. ...
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