# irandm(3f) [bsd man page]

```RANDOM(3F)																RANDOM(3F)

NAME
random, drandm, irandm - better random number generator

SYNOPSIS
function irandm (iflag)

function random (iflag)

double precision function drandm (iflag)

DESCRIPTION
These  functions use random(3) to generate sequences of random numbers, and should be used rather than the older functions described in man
3f rand.  If iflag is non-zero, it is used as a new seed for the random number generator, and the first new random value is returned.

Irandm returns positive integers in the range 0 through 2147483647 ( 2**31-1).  Random and drandm return values in the range 0. through 1.0
by dividing the integer random number from random(3) by 2147483647 .

FILES
/usr/lib/libF77.a

random(3)

4.3 Berkeley Distribution					   May 15, 1985 							RANDOM(3F)```

## Check Out this Related Man Page

```RANDOM(3)						     Linux Programmer's Manual							 RANDOM(3)

NAME
random, srandom, initstate, setstate - random number generator.

SYNOPSIS
#include <stdlib.h>

long int random(void);
void srandom(unsigned int seed);
char *initstate(unsigned int seed, char *state, size_t n);
char *setstate(char *state);

DESCRIPTION
The  random()  function	uses  a non-linear additive feedback random number generator employing a default table of size 31 long integers to
return successive pseudo-random numbers in the range from 0 to RAND_MAX.  The period of this random number generator is very large, approx-
imately 16*((2**31)-1).

The  srandom()  function  sets  its  argument  as  the seed for a new sequence of pseudo-random integers to be returned by random().  These
sequences are repeatable by calling srandom() with the same seed value.	If no seed value is provided, the random() function  is  automati-
cally seeded with a value of 1.

The  initstate() function allows a state array state to be initialized for use by random().  The size of the state array n is used by init-
state() to decide how sophisticated a random number generator it should use -- the larger the state array, the better  the  random  numbers
will  be.   seed  is  the  seed	for  the initialization, which specifies a starting point for the random number sequence, and provides for
restarting at the same point.

The setstate() function changes the state array used by the random() function.  The state array state is used for random number	generation
until  the next call to initstate() or setstate().  state must first have been initialized using initstate() or be the result of a previous
call of setstate().

RETURN VALUE
The random() function returns a value between 0 and RAND_MAX.  The srandom() function returns no value.	 The  initstate()  and	setstate()
functions return a pointer to the previous state array, or NULL on error.

ERRORS
EINVAL A state array of less than 8 bytes was specified to initstate().

NOTES
Current	"optimal"  values  for	the size of the state array n are 8, 32, 64, 128, and 256 bytes; other amounts will be rounded down to the
nearest known amount.  Using less than 8 bytes will cause an error.

CONFORMING TO
BSD 4.3

rand(3), srand(3)

GNU								    2000-08-20								 RANDOM(3)```
Man Page

## Mac OS X: Based on UNIX - Solid As a Rock

See this threads: Page Not Found - Apple Open Source - Apple

## Simple rules of the UNIX.COM forums:

RULES OF THE UNIX AND LINUX FORUMS For the latest version of the community rules (the official community rules page), please visit here. No flames, shouting (all caps), sarcasm, bullying, profanity or arrogant posts. No negative comments about others or impolite remarks. Be patient. No...

## Scripts without shebang

I see lot of ad-hoc shell scripts in our servers which don't have a shebang at the beginning . Does this mean that it will run on any shell ? Is it a good practice to create scripts (even ad-hoc ones) without shebang ?

## Is UNIX an open source OS ?

Hi everyone, I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX. Ok onto business, my questions are-: Was/Is UNIX ever an open source operating system ? If UNIX was...

## Memory leak with awk on MacOs

Dear all, I use awk quite a bit for data wrangling ... today I find weird behavior that I cannot wrap my head around. if I execute the following command (simplified to illustrate the behavior ... nothing to do with the real command) bash-3.2\$ awk...

## Mail/mailx ignores newline formatting Problem.

I have a file hello.txt which i wish to send as a email body (not attachment). cat -ev hello.txt 1\$ 2\$ 3\$ I use the following command to send the hello.txt as the email body. mailx -s "Alert" myteam@mycomp.com<hello.txt However, the email received has this in the email body 123...

## LM 19.1 from pendrive

I've "installed" LM 19.1 to a PNY 16Gb(2.0) pendrive. I have a few issues that I'd like to resolve. First and foremost, the O.S. experiences "lagging" issues and to a lesser degree, freezing. Example: Complete "boot-up" (from start to complete "home" page) can take upwards of 7 mins. Then when...

## UNIX Environment Setup - (Just starting!)

Morning All So, I am starting looking into the world of UNIX for a new job (luckily not my primary function!) and I am looking to get stared. Like anything I seem to learn best by trying things out first in an environment but I have a key question: Currently I use Oracle VirtualBox, can...

## Is it safe to install x86 Solaris 10 U6 after installed-Linux-and-FreeBSD?

I've installed Slack 14.2 on /dev/sda1 (/dev/sda2 is swap) and FreeBSD 12 on /dev/sda3 and lilo is the boot manager. FreeBSD slices are as follows; / on /dev/ada0S3a, swap on /dev/ada0s3e, /var on /dev/ada0s3b, /tmp on /dev/ada0s3d and /usr on /dev/ada0s3f. I hesitate to install Solaris 10...

## [Tip] How to display the number of logged-in users

In a professional environment with traditional application you often want (or are asked) to report the users. Traditionally there is the who command who | awk '{print \$1}'telnetd or sshd register the users in the utmp file, to be shown with who, w, users, finger, pinky, ... In addition they...