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As illustrated <FILEHANDLE> reads either single line or full file depending on whether one stores it in a scalar or a array variable
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print FILEHANDLE list; # writes list onto FILEHANDLE
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print list; # is equivalent to
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print STDOUT list;
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There are a whole set of test operators which act on file NAMES not file HANDLES
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-e $filename returns true if $filename EXISTS
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-r $filename returns true if $filename is READABLE
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-w $filename returns true if $filename is WRITABLE
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-x $filename returns true if $filename is EXECUTABLE
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