OK, tried that, but I still don't get what Stein says I should get. Also, any idea on why Linux doesn't work? Here's what I get on Windows 98 with your suggestion:

Writing line 1
Read_three got: This is line number 1
Writing line 2
Read_three got: This is line number 2
Writing line 3
Read_three got: This is line number 3
Writing line 4
Writing line 5
Writing line 6
Writing line 7
Writing line 8
Writing line 9
Writing line 10
Wrote 3 lines of text
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$PM = "Perl Monk's";
$MCF = "Most Clueless Friar Abbot Bishop";
$nysus = $PM . $MCF;
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