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Ruby Programming
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Opening and Closing Files

As you might expect, you can create a new file object using File.new .

aFile = File.new("testfile", "r")

# ... process the file

aFile.close

You can create a File object that is open for reading, writing, or both, according to the mode string (here we opened ``testfile'' for reading with an ``r''). The full list of allowed modes appears on page 326. You can also optionally specify file permissions when creating a file; see the description of File.new on page 303 for details. After opening the file, we can work with it, writing and/or reading data as needed. Finally, as responsible software citizens, we close the file, ensuring that all buffered data is written and that all related resources are freed.

But here Ruby can make life a little bit easier for you. The method File.open also opens a file. In regular use, it behaves just like File.new . However, if there's a block associated with the call, open behaves differently. Instead of returning a new File object, it invokes the block, passing the newly opened File as a parameter. When the block exits, the file is automatically closed.

File.open("testfile", "r") do |aFile|

# ... process the file

end
Ruby Programming
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