#print $hash{key} "This is line 4.\n";
Note {} curly braces around $hash{key}:
print {$hash{key}} "This is line 4.\n";
Update: From print:
If you're storing handles in an array or hash, or in general
whenever you're using any expression more complex than a
bareword handle or a plain, unsubscripted scalar variable to
retrieve it, you will have to use a block returning the
filehandle value instead, in which case the LIST may not be
omitted:
print { $files[$i] } "stuff\n";
print { $OK ? *STDOUT : *STDERR } "stuff\n";
(Update: The documentation excerpted here refers to Indirect Object syntax. Please see kcott's ++reply and the replies of others in this thread for the way to avoid this syntax and for the wisdom of doing so.)
Give a man a fish: <%-{-{-{-<
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