use warnings;
use strict;

open testFile, '>', 'delme.txt';
print testFile <<TEST;
Test file line 1
Test file line 2
Test file line 3
TEST
close testFile;

open testFile, '<', 'delme.txt';
<DATA>;
print "DATA: $.\n";
<testFile>;
print "Test: $.\n";
<testFile>;
<testFile>;
print "Test: $.\n";
<DATA>;
print "DATA: $.\n";
seek testFile, 0, 0;
$. = 0;
print "Test: $.\n";
<DATA>;
print "DATA: $.\n";

close testFile;

__DATA__
3
1
2
5