In awk, the rand() function is seeded with the actual system epoch time, and srand() "returns the value of the previous seed" (c.f. man awk). No need to supply an external datetimestamp. Try this
Hi all,
I've a shell script which runs on Bourne shell. I've to do a date comparison. If the value of the supplied parameter(in format YYYYMMDD)is greater than todays's date(format YYYYMMDD), it should prompt the user that the supplied date is greater than today's date. The script is given... (6 Replies)
Hi
I have this simple script:
#!/bin/bash
date1=2009:07:15:12:36
date2=2009:07:15:12:16
echo $date1
echo $date2
datediff=
#datediff=date1-date2
echo datediff is$datediff
How do i return the difference in seconds? (6 Replies)
1. The problem statement, all variables and given/known data:
I have standard web server log file. It contains different columns (like IP address, request result code, request type etc) including a date column with the format .
I have developed a log analysis command line utility that displays... (1 Reply)
Date comparison
Hello all
I am writing a scrip that will take action so long as the date with in the file is older than 3 months. The file will contain multiple rows of data. Each row will probably start with the date. My question... What is the exact code that should be used for date... (1 Reply)
Hi friends,
I would like to compare two dates in an IF statement.
This is what I am trying, but it doesn't work.
date=20120122
minus=6
if ; then
...
fi
what would the IF clause looks like?
Thanks! :) (5 Replies)
hi,
I have a file named user.cfg under /var/member/
#user.cfg file under /var/member/
login user: root #how are you
login pass: admin #where are you
M: user1 pass1 #20121008
M: user2 pass2 #20111230
M: user3 pass3 #20091220
M: user4 pass4 #20070210
M: user5 pass5 #20130708
M:... (3 Replies)
Hi
Need some function or step to compare the date as given below.
Example:
Date_1: 25/04/2013
Date_2: 20/07/2012
if Date_1 is greater than Date_2 then
do...
else
do..
fi
Need exact unix steps to compare the above condition
Use code tags please, see PM. (5 Replies)
I have below txt file
02.05.2014
10.05.2014
17.09.2014
My requirement is the user enter date field should compare the input file
if user enter date as 12.03.2013 it should compare with all date one by one from input file
12.03.2013 -ne 02.05.2014
12.03.2013 -ne 10.05.2014... (3 Replies)
Discussion started by: stew
3 Replies
LEARN ABOUT REDHAT
rand
RAND(3) Linux Programmer's Manual RAND(3)NAME
rand, srand - random number generator.
SYNOPSIS
#include <stdlib.h>
int rand(void);
void srand(unsigned int seed);
DESCRIPTION
The rand() function returns a pseudo-random integer between 0 and RAND_MAX.
The srand() function sets its argument as the seed for a new sequence of pseudo-random integers to be returned by rand(). These sequences
are repeatable by calling srand() with the same seed value.
If no seed value is provided, the rand() function is automatically seeded with a value of 1.
RETURN VALUE
The rand() function returns a value between 0 and RAND_MAX. The srand() returns no value.
NOTES
The versions of rand() and srand() in the Linux C Library use the same random number generator as random() and srandom(), so the lower-
order bits should be as random as the higher-order bits. However, on older rand() implementations, the lower-order bits are much less ran-
dom than the higher-order bits.
In Numerical Recipes in C: The Art of Scientific Computing (William H. Press, Brian P. Flannery, Saul A. Teukolsky, William T. Vetterling;
New York: Cambridge University Press, 1992 (2nd ed., p. 277)), the following comments are made:
"If you want to generate a random integer between 1 and 10, you should always do it by using high-order bits, as in
j=1+(int) (10.0*rand()/(RAND_MAX+1.0));
and never by anything resembling
j=1+(rand() % 10);
(which uses lower-order bits)."
Random-number generation is a complex topic. The Numerical Recipes in C book (see reference above) provides an excellent discussion of
practical random-number generation issues in Chapter 7 (Random Numbers).
For a more theoretical discussion which also covers many practical issues in depth, please see Chapter 3 (Random Numbers) in Donald E.
Knuth's The Art of Computer Programming, volume 2 (Seminumerical Algorithms), 2nd ed.; Reading, Massachusetts: Addison-Wesley Publishing
Company, 1981.
CONFORMING TO
SVID 3, BSD 4.3, ISO 9899
SEE ALSO random(3), srandom(3), initstate(3), setstate(3)GNU 1995-05-18 RAND(3)