Split MySQL dump into a file per database

splitmysqldump.pl

#!/usr/bin/perl -w
#
# splitmysqldump - split mysqldump file into per-database dump files.
use strict;
use warnings;
my $dbfile;
my $dbname = q{};
my $header = q{};
while (<>) {

   

# Beginning of a new database section:
    # close currently open file and start a new one
    if (m/-- Current Database\: \`([-\w]+)\`/) {
    if (defined $dbfile && tell $dbfile != -1) {
        close $dbfile or die "Could not close file!"
    } 
    $dbname = $1;
    open $dbfile, ">>", "$1_dump.sql" or die "Could not create file!";
    print $dbfile $header;
    print "Writing file $1_dump.sql ...\n";
    }
    if (defined

$dbfile && tell $dbfile != -1) {
    print $dbfile $_;
    }
    # Catch dump file header in the beginning
    # to be printed to each separate dump file.  
    if (!

$dbname) { $header .= $_; }
}
close $dbfile or die "Could not close file!"

Can't use an undefined value as a symbol reference at bin/splitmysqldump.pl line 34, <> line 4.