If you need it to be truly random, you'll need a suitable random number generator.
Once you have 100 random (or predefined if that's all you need) numbers, normalise them against the number of lines in your file (I'd suggest you select 100 numbers between 0 and 1, then multiply that by the lines in the file). That will give you a list of 100 lines numbers.
Code:
#!/bin/sh
# make LINES contain a space seperated list of your line numbers
INPUT="abc.txt"
OUTPUT="test.txt"
rm -f $OUTPUT
for line in $LINES
do
head -$line $INPUT | tail -1 >> $OUTPUT
done
It's clumsy and won't be very quick (especially for lines further into the file) but it'll do the job.
A better solution would be to seek into the file the correct distance and just dd out the required data.
I have tried to show the file name whose size is greater than 200 byte in current directory.
Please help me.
ls -l | tr -s " " " " | cut -f 5,9 -d " " >out.txt
#set -a x `cat out.txt`
i=0
`cat out.txt` | while
do
read x
echo $x
#re=200
j=0
if }" < "200" ]
then
echo $j
j=`expr $j... (2 Replies)
I have a text file with hundreds of lines, i wish to run a script and reads a random line to pass it to another command line such as:
for line in `cat file |grep random line`; do echo $line |mail my@example.com ; done
thank you (6 Replies)
Hi,
We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the... (1 Reply)
Hi,
I am creating a progress bar for file upload for which I have CGI script which copies the data and depending on certain bytes it increments the progress bar. Here, I am writing the incremented value to a file which is read by Ajax at server end. However, here I want to ask that, is it... (18 Replies)
I have got a file in following format:
AAAAAAA
BBBBBBBB
CCCCCCC
DDDDDDD
I am trying to read this file and out put it in following format:
AAAAAAA,BBBBBBB,CCCCCCC,DDDDDD
Preferred method is shell or Perl.
Any help appreciated. (11 Replies)
Hello Guys, How all are doing?
I have an issue in Unix and want help from all of you
I have a file in UNIX which it read by line by line , If at the end of line '0' is written the it should fetch that line into another file and change '0' to '1'
and If at the end of line '1' is written then it... (10 Replies)
Hi,
I am trying to do a write operation followed by a read operation on the same file through Perl, expecting the output produced by read to contain the new lines added, as follows:
#! /usr/bin/perl -w
open FH, "+< testfile" or die "$@";
print FH "New content added\n";
while (my $line =... (1 Reply)
Hi. How can I read row number from one file and print that corresponding record present at that row in another file.
eg
file1
1
3
5
7
9
file2
11111
22222
33333
44444
55555
66666
77777
88888
99999 (3 Replies)
Hi
I am trying to build a web form where it can take the input from the user and write it to a file. And when I will open that form again that for should read the file that was created at the 1st step and all the fields should auto populate from that file. I have 20 text fields in my form. I... (1 Reply)
Hi All,
We have a file in the following format:
0.010000 $ ITI 11 LV2 $ 40456211 $
0.135000 $ ITI 11 LV1 $ 40512211 $
1.215600 $ ITI 11 ITI3 $ 41406211 $
24/05/2014 14:05:02
0.030000 $ ITI 11 LV2 $ 40456211 $
... (3 Replies)
Discussion started by: gauravsinghal79
3 Replies
LEARN ABOUT DEBIAN
statistics::test::randomwalk
Statistics::Test::RandomWalk(3pm) User Contributed Perl Documentation Statistics::Test::RandomWalk(3pm)NAME
Statistics::Test::RandomWalk - Random Walk test for random numbers
SYNOPSIS
use Statistics::Test::RandomWalk;
my $tester = Statistics::Test::RandomWalk->new();
$tester->set_data( [map {rand()} 1..1000000] );
my $no_bins = 10;
my ($quant, $got, $expected) = $tester->test($no_bins);
print $tester->data_to_report($quant, $got, $expected);
DESCRIPTION
This module implements a Random Walk test of a random number generator as outlined in Blobel et al (Refer to the SEE ALSO section).
Basically, it tests that the numbers "[0,1]" generated by a random number generator are distributed evenly. It divides "[0,1]" into "n"
evenly sized bins and calculates the number of expected and actual random numbers in the bin. (In fact, this counts the cumulated numbers,
but that works the same.)
METHODS
new
Creates a new random number tester.
set_rescale_factor
The default range of the random numbers [0, 1) can be rescaled by a constant factor. This method is the setter for that factor.
rescale_factor
Returns the current rescaling factor.
set_data
Sets the random numbers to operate on. First argument must be either an array reference to an array of random numbers or a code reference.
If the first argument is a code reference, the second argument must be an integer "n". The code reference is called "n"-times and its
return values are used as random numbers.
The code reference semantics are particularly useful if you do not want to store all random numbers in memory at the same time. You can
write a subroutine that, for example, generates and returns batches of 100 random numbers so no more than 101 of these numbers will be in
memory at the same time. Note that if you return 100 numbers at once and pass in "n=50", you will have a sequence of 5000 random numbers.
test
Runs the Random Walk test on the data that was previously set using "set_data".
First argument must be the number of bins.
Returns three array references. First is an array of quantiles. If the number of bins was ten, this (and all other returned arrays) will
hold ten items.
Second are the determined numbers of random numbers below the quantiles. Third are the expected counts.
data_to_report
From the data returned by the "test()" method, this method creates a textual report and returns it as a string.
Do not forget to pass in the data that was returned by "test()" or use the "test_report()" method directly if you do not use the data
otherwise.
SUBROUTINES
n_over_k
Computes "n" over "k". Uses Perl's big number support and returns a Math::BigFloat object.
This sub is memoized.
SEE ALSO
Math::BigFloat, Memoize, Params::Util
Random number generators: Math::Random::MT, Math::Random, Math::Random::OO, Math::TrulyRandom, "/dev/random" where available
Statistics::Test::Sequence
The algorithm was taken from: (German)
Blobel, V., and Lohrmann, E. Statistische und numerische Methoden der Datenanalyse. Stuttgart, Leipzig: Teubner, 1998
AUTHOR
Steffen Mueller, <smueller@cpan.org>
COPYRIGHT AND LICENSE
Copyright (C) 2007-2010 by Steffen Mueller
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.6 or, at
your option, any later version of Perl 5 you may have available.
perl v5.10.1 2011-01-01 Statistics::Test::RandomWalk(3pm)