Opening Files
To read or write files in Perl, you need to open a filehandle. Filehandles in Perl are yet another kind of variable. They act as convenient references (handles, if you will) between your program and the operating system about a particular file. They contain information about how the file was opened and how far along you are in reading (or writing) the file; they also contain user-definable attributes about how the file is to be read or written.
From previous hours you're already familiar with one filehandle: STDIN. This filehandle is given to you automatically by Perl when your program starts, and it's usually connected to the keyboard device (you'll learn more details about STDIN later). The format for filehandle names is the the ...
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