If you don't understand something read the documentaiton and make a short example to illustrate what it's doing in order to better understand what's going on.

my $i=0;
my $x = rand $i++;
print "$x\n";
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Update: typo

I understood the working of rand function. It calculate a random number which is checked against the if condition and if passed than the filename is given. But what if I want to specify to generate atleast 50 or 100 random files?

One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man. -Elbert Hubbard

Use the iterator with a while loop and just keep a count (or array) of the number of randomly selected files. Use last when you have enough. Or, if you run out of files, re-generate the iterator.

For what it's worth, you can even put the randomness into the iterator:

my $rule = Path::Iterator::Rule->new->file->and(sub { rand() < 0.1 });
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I just shipped PIR 1.005 to CPAN to fix broken tests on Windows.

-xdg

Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.

But what if I want to specify to generate atleast 50 or 100 random files?

Then, like, change the function somehow, do something inside it , to keep track of more than one random filename, like some kind of a variable that has more than one thing in it ... :P