11-14-2002
assuming a file size of 5 lines execute both these loops on your machine... you need to type CTRL+C to break the loops when you want...
Quote:
while [ 1 -gt 0 ]; do
expr $RANDOM % 5 + 1
done > newfile
Quote:
while [ 1 -gt 0 ]; do
expr \( 1 + $RANDOM \) \* 5 / 32768
done > newfile2
you will notice that newfile2 for most of the time won't contain 5... so the second way won't lead to a uniform distribution between 1 and $nlines... in fact most of the time it won't generate $nline at least for small $nline values...
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LEARN ABOUT DEBIAN
crypt::random::source::base
Crypt::Random::Source::Base(3pm) User Contributed Perl Documentation Crypt::Random::Source::Base(3pm)
NAME
Crypt::Random::Source::Base - Abstract base class for Crypt::Random::Source classes
SYNOPSIS
use Moose;
extends qw(Crypt::Random::Source::Base);
DESCRIPTION
This is an abstract base class.
In the future it will be a role.
METHODS
get $n, %args
Gets $n random bytes and returns them as a string.
This method may produce fatal errors if the source was unable to provide enough data.
read $buf, $n, [ $off ]
This method is cannibalized from IO::Scalar. It provides an IO::Handle work-alike.
Note that subclasses override this to operate on a real handle directly if available.
seed @stuff
On supporting sources this method will add @stuff, whatever it may be, to the random seed.
Some sources may not support this, so be careful.
available
This is a class method, such that when it returns true calling "new" without arguments on the class should provide a working source of
random data.
This is use by Crypt::Random::Source::Factory.
rank
This is a class method, with some futz value for a ranking, to help known good sources be tried before known bad (slower, less available)
sources.
get_data %Params
Provided for compatibility with Crypt::Random
AUTHOR
Yuval Kogman <nothingmuch@woobling.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2011 by Yuval Kogman.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
perl v5.14.2 2011-01-05 Crypt::Random::Source::Base(3pm)