you're not opening a filehandle correctly.

open( OUT, ">outfile" );
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if you're planning to blow away the contents of the file each time you run your script, or

open( OUT, ">>outfile" );
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if you want to update your code.

i'm surprised you're getting a filehandle opened at all . . .

UPDATE: i stand corrected. tye has the right idea - the filehandle is blocking. i had to do similar 'magic' on a project.

close the filehandle, then re-open it. that'll flush the buffer, and you should see ( at least ) the 'hello' string.