I agree with Forsaken. Just do something like the following:

use strict;
use warnings;

my $fname = 'myfile';
my $limit = 50 * 1024;
my ($size, $fc, $handle, $printstr) = (0, 1);

open ($handle, ">$fname$fc");
for (1..100) {
    $printstr = '-'x1000 . "\n";
    if ($limit < $size + length($printstr)) {
        close($handle);
        $size = 0; $fc++;
        open ($handle, ">$fname$fc");
    }
    print $handle $printstr;
    $size += length($printstr);
}
close($handle);
[download]

If you have control over your prints, you also have the ability to check the lengths of the strings you're printing, which you can then use to keep track of how large the file is.

Of course, you'll need to do (one) initial stat if you begin by appending to an existing file.

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.