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)
Hi...How can I generate random numbers between a given range ...preferably between 1 and 100...in UNIX C programming...?
I tried out functions like rand(),drand48() etc but didnt get satisfactory results...
Thanks a lot in advance.......... (1 Reply)
HI
please help me in solving this issue.
I have a shell script which consists of ten statemnts ( i mean 10 executable statments)...........and if i run that script the 10 statmenst will execute continously ............
But now my probelm is i have to write another script --> to... (0 Replies)
Dear all,
I get the situation from my office but i cannot think what is happening. please give me some advise.
1. some file owner and group is changed to a very long number
2. i login as root. when i touch a file or operate on the file like chown, cp, the response is "Read-only file system".... (1 Reply)
Im new to C, and Im having a hard time getting a random number.
In bash, I would do something similar to the following to get a random number;
#!/bin/bash
seed1=$RANDOM
seed2=$RANDOM
seed3=$RANDOM
SEED=`expr $seed1 * $seed2 / $seed3`
echo ${SEED%.*}
Now, in online examples... (4 Replies)
I need to generate and reuse a 5 digit random number every time my program is executed. But the following generates random numbers every time the function is called.
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <time.h>
... (12 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,
I'm trying to create a script that will print random numbers with length of three.
Below is the expected out.
928-377-899
942-458-310
951-948-511
962-681-415
995-161-708
997-997-209
thanks (4 Replies)
How can I choose randomly the row numbers of my file in awk? (4 Replies)
Discussion started by: Homa
4 Replies
LEARN ABOUT MOJAVE
urandom
RANDOM(4) BSD Kernel Interfaces Manual RANDOM(4)NAME
random , urandom -- random data source devices.
SYNOPSIS
pseudo-device random
DESCRIPTION
The random device produces uniformly distributed random byte values of potentially high quality.
To obtain random bytes, open /dev/random for reading and read from it.
The same random data is also available from getentropy(2). Using the getentropy(2) system call interface will provide resiliency to file
descriptor exhaustion, chroot, or sandboxing which can make /dev/random unavailable. Additionally, the arc4random(3) API provides a fast
userspace random number generator built on the random data source and is preferred over directly accessing the system's random device.
/dev/urandom is a compatibility nod to Linux. On Linux, /dev/urandom will produce lower quality output if the entropy pool drains, while
/dev/random will prefer to block and wait for additional entropy to be collected. With Yarrow, this choice and distinction is not necessary,
and the two devices behave identically. You may use either.
The random device implements the Yarrow pseudo random number generator algorithm and maintains its entropy pool. The kernel automatically
seeds the algorithm with additional entropy during normal execution.
FILES
/dev/random
/dev/urandom
HISTORY
A random device appeared in the Linux operating system.
Darwin September 6, 2001 Darwin