How to generate a random integer with specific range(for example, from 1 to 1000)?
Also, how to convert a floating point number into a integer? (2 Replies)
Hello All...
Can someone help me generate a random password which will be 7 characters long which contains alpha-numeric characters using shell script.
I am looking to store the output of the script that generates the password to a variable within a script and use it as the password.
... (5 Replies)
I need a function to generate a random alphanumeric password in C code. It needs to be between 6-8 characters and follow the following rules:
Reject if same char appears # time: 4 or more
Reject if same char appears consecutively: 3 or more
I have the following random password working for... (2 Replies)
Hi, Guz!
I'm working on a scripts compiler which needs a function to generate random strings. I think REGX may be a good solution to restrict the string format. Before DIYing I'd like asking for any existing libs or codes.
Any help will be appreciated! (7 Replies)
I saw this formula to generate random number between two specified values in shell script.the following.
$(((RANDOM%(max-min+divisibleBy))/divisibleBy*divisibleBy+min))
Give a example in book.
Generate random number between 6 and 30.like this.
$(((RANDOM%30/3+1)*3))
But I have a... (1 Reply)
hi guys,
I am writing a c program that generates a two dimensional array to make matrix and a vector of random numbers and perform multiplication. I can't figure out whats wrong with my code. It generates a matrix of random numbers but all the numbers in the vector array is same and so is the... (2 Replies)
i want to generate a random number through a script, and even if anyone reads the script, they wont be able to figure out what the random number is. only the person who setup the script would know it.
something like this could work: random
the full thread is here:
... (13 Replies)
Need to use dd to generate a large file from a sample file of random data. This is because I don't have /dev/urandom.
I create a named pipe then:
dd if=mynamed.fifo do=myfile.fifo bs=1024 count=1024
but when I cat a file to the fifo that's 1024 random bytes:
cat randomfile.txt >... (7 Replies)
Hi,
Is anybody experience generate a pair of random number by using awk command?
I wanna to generate a pair of random number (range from 1 to 4124) and repeats it 416 times.
Desired output
2 326
123 1256
341 14
3245 645
.
.
.
I did write the below command:
awk... (5 Replies)
Discussion started by: perl_beginner
5 Replies
LEARN ABOUT DEBIAN
bsd::arc4random
BSD::arc4random(3pm) User Contributed Perl Documentation BSD::arc4random(3pm)NAME
BSD::arc4random - Perl interface to the arc4 random number generator
SYNOPSIS
use BSD::arc4random qw(:all);
$v = arc4random();
$v = arc4random_uniform($hz);
if (!BSD::arc4random::have_kintf()) {
$v = arc4random_addrandom("entropy to pass to the system");
} else {
$v = arc4random_pushb("entropy to pass to the system");
$v = arc4random_pushk("entropy to pass to the kernel");
}
$s = arc4random_bytes(16, "entropy to pass to libc");
arc4random_stir();
$s = arc4random_bytes(16);
print $RANDOM;
DESCRIPTION
This set of functions maps the arc4random(3) family of libc functions into Perl code. All functions listed below are ithreads-safe. The
internal XS functions are not, but you are not supposed to call them, either.
On module load, perl's internal PRNG is re-seeded, as a bonus, using srand with an argument calculated from using arc4random_pushb on some
entropy returned from rand's previous state.
LOW-LEVEL FUNCTIONS
arc4random()
This function returns an unsigned 32-bit integer random value.
arc4random_addrandom(pbuf)
This function adds the entropy from pbuf into the libc pool and returns an unsigned 32-bit integer random value from it.
arc4random_pushb(pbuf)
This function first pushes the pbuf argument to the kernel if possible, then the entropy returned by the kernel into the libc pool,
then returns an unsigned 32-bit integer random value from it.
arc4random_pushk(pbuf)
This function first pushes the pbuf argument to the kernel if possible, then returns an unsigned 32-bit integer random value from the
kernel.
This function is deprecated. Use arc4random_pushb instead.
arc4random_stir()
This procedure attempts to retrieve new entropy from the kernel and add it to the libc pool. Usually, this means you must have access
to the urandom(4) device; create it inside chroot(2) jails first if you use them.
have_kintf()
This constant function returns 1 if arc4random_pushb and/or arc4random_pushk actually call the kernel interfaces, 0 if they merely map
to arc4random_addrandom instead.
HIGH-LEVEL FUNCTIONS
arc4random_bytes(num[, pbuf])
This function returns a string containing as many random bytes as requested by the integral argument num. An optional pbuf argument is
passed to the system first.
arc4random_uniform(upper_bound)
Calculate a uniformly distributed random number less than upper_bound avoiding "modulo bias".
PACKAGE VARIABLES
$RANDOM
The $RANDOM returns a random value in the range [0; 32767] on each read attempt and pushes any value it is assigned to the kernel. It
is tied at module load time.
tie variable, 'BSD::arc4random'[, max]
You can tie any scalar variable to this package; the max argument is the maximum number returned; if undefined, 0 or >= 0xFFFFFFFF, no
bound is used, and values in the range [0; 2**32-1] are returned. They will behave like $RANDOM.
AUTHOR
Thorsten Glaser <tg@mirbsd.de>
SEE ALSO
The arc4random(3) manual page, available online at: <https://www.mirbsd.org/man/arc4random.3>
Perl's rand and srand functions via perlfunc and perlfaq4.
The randex.pl plugin for Irssi, implementing the MirOS RANDEX protocol (entropy exchange over IRC), with CVSweb at:
<http://cvs.mirbsd.de/ports/net/irssi/files/randex.pl>
<https://www.mirbsd.org/a4rp5bsd.htm> when it's done being written.
COPYRIGHT AND LICENSE
Copyright (c) 2008, 2009, 2010, 2011 Thorsten "mirabilos" Glaser Copyright (c) 2009 Benny Siegert Credits to Sebastian "Vutral" Schwarz
This module is covered by the MirOS Licence: http://mirbsd.de/MirOS-Licence <http://mirbsd.de/MirOS-Licence>
The original C implementation of arc4random_uniform was contributed by Damien Miller from OpenBSD, with simplifications by Jinmei Tatuya.
perl v5.14.2 2011-06-05 BSD::arc4random(3pm)