According to the standards, awk's rand() function returns a pseudo-random number x such that 0 < x < 1. If we assume that the pseudo-random number is uniformly distributed (which is not required by the standards), then (rand() <= .01) should be true approximately 1% of the time. For 10%, the test would be ICODE](rand() <= .1)[/ICODE] (again, assuming rand() produces a uniformly distributed set of values).
Note that when using "random" numbers, there is certainly no guarantee that using (rand() <= 10000/200000) as the test in Jotne's script will print exactly 10,000 lines from a 200,000 line file.
Hi everybody,
Does somebody has a sample of script that control a daemon?
for example use loop until the daemon is on and if is not on
do something else?
Thanks
Pier (0 Replies)
i have a file having 30 million records.i want to generate a file having say 5% of total records in another file. the records in the new file shud be randomly generated. (1 Reply)
1. Can somebody tell me the log file location of HPVM where all the events of guest OS are reported ?
2. And if possible a log file with important events in it ? (1 Reply)
Hello, I'm new to this forum, and I apologize in advance if I did something wrong here.
I am pretty stumped here as I am still getting the error message, "./comc1.sh: test: argument expected." after executing the script itself.
Here's the script file I modified:
I tried executing line 4... (1 Reply)
Dear All,
I have a template xml file like below.
....Some---Header.......
<SignalPreference>
...
<SignalName>STRING</SignalName>
...
</SignalPreference>
......Some formatting text.......
<SignalPreference>
.........
... (3 Replies)
Hi,
I need a sample script to validate all the database objects like
1. table structure(columns, datatypes,key contraints if any)
2. synonyms
3. grants
4. indexes
....etc
thank you! (2 Replies)
Below is the code. Its the 1st line of a file.
How can I remove the bracket and display like below.
123 web int 1 09:30:45 2013
I dont want to use AWK or SED or PERL. I need to use only the bash shell scripting commands to do it. (3 Replies)
Sample shell script to add a user:
Today i learn how to add a user to linux server with a password.
#!/bin/bash
# Script to add a user to Linux system
if ; then
read -p "Enter username : " username
read -s -p "Enter password : " password
egrep "^$username" /etc/passwd >/dev/null
if ;... (0 Replies)
Discussion started by: ulaxmi
0 Replies
LEARN ABOUT SUNOS
srand
rand(3C) Standard C Library Functions rand(3C)NAME
rand, srand, rand_r - simple random-number generator
SYNOPSIS
#include <stdlib.h>
int rand(void);
void srand(unsigned int seed);
int rand_r(unsigned int *seed);
DESCRIPTION
The rand() function uses a multiplicative congruential random-number generator with period 2**32 that returns successive pseudo-random num-
bers in the range of 0 to RAND_MAX (defined in <stdlib.h>).
The srand() function uses the argument seed as a seed for a new sequence of pseudo-random numbers to be returned by subsequent calls to
rand(). If srand() is then called with the same seed value, the sequence of pseudo-random numbers will be repeated. If rand() is called
before any calls to srand() have been made, the same sequence will be generated as when srand() is first called with a seed value of 1.
The rand_r() function has the same functionality as rand() except that a pointer to a seed seed must be supplied by the caller. If
rand_r() is called with the same initial value for the object pointed to by seed and that object is not modified between successive calls
to rand_r(), the same sequence as that produced by calls to rand() will be generated.
The rand() and srand() functions provide per-process pseudo-random streams shared by all threads. The same effect can be achieved if all
threads call rand_r() with a pointer to the same seed object. The rand_r() function allows a thread to generate a private pseudo-random
stream by having the seed object be private to the thread.
USAGE
The spectral properties of rand() are limited. The drand48(3C) function provides a better, more elaborate random-number generator.
When compiling multithreaded applications, the _REENTRANT flag must be defined on the compile line. This flag should be used only in mul-
tithreaded applications.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
SEE ALSO drand48(3C), attributes(5), standards(5)SunOS 5.10 19 May 2004 rand(3C)