On Fri, Aug 28, 2015 at 11:01:45AM +0200, Martijn van Duren wrote:
> Here's some potential useful feature from my .profile. It might not be
> perfect, but at least it's better then some of the generators I've seen in
> production.
>
> # $RANDOM is not portable and in ksh it's limited to 32767.
> rand() {
> local number
> local rdevice
>
> for rdevice in /dev/{u,}random fail; do
> test -c $rdevice -a -r $rdevice && break
> done
> test $rdevice = "fail" && return 1
>
> number=$(dd if=$rdevice bs=4 count=1 2>/dev/null | hexdump -e '/4
> "%u\n"')
> if [ -z "$1" ]; then
> echo $number
> else
> echo $(($number % $(($1 + 1))))
> fi
> }
One can use 'openssl rand' here for results of the same quality in
less lines.
--
Matthieu Herrb
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