Just look at the code after the second paragraph of readdir, where the intended location of "prepend" is shown. The location is not in the readdir() call, but in the later usage, because readdir() only returns the bare name, not the full path to the directory entry.

@dots = grep { /^\./ && -f "$some_dir/$_" } readdir($dh);

Thanks a lot

Either prepend the directory name when doing the file tests inside the loop:

my $dir = "/home/gaurav/Documents";
opendir my $dh, $dir or die "Couldn't open $dir: $!";

while (readdir $dh) {
    next if $_ eq "." or $_ eq ".." ;
    print $_, " " x (30 - length($_));
    
    my $file = "$dir/$_";
    
    # ...do file tests against $file here
}
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Or use chdir to change the working directory before entering the loop where you do the file tests:

my $dir = "/home/gaurav/Documents";
opendir my $dh, $dir or die "Couldn't open $dir: $!";

chdir($dir);

while (readdir $dh) {
    next if $_ eq "." or $_ eq ".." ;
    print $_, " " x (30 - length($_));
    
    # ...do file tests against $_ here
}
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Thanks @smls...Thanks a lote