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Ruby Opening, Reading, Writing, Closing Files

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  1. ###
  2. #   r   Open a file for reading. The file must exist.
  3. #
  4. #   w   Create an empty file for writing. If a file with the same name 
  5. #       already exists its content is erased and the file is treated as a new 
  6. #       empty file.
  7. #
  8. #   a   Append to a file. Writing operations append data at the end of the 
  9. #       file. The file is created if it does not exist.
  10. #
  11. #   r+  Open a file for update both reading and writing. The file must exist.
  12. #
  13. #   w+  Create an empty file for both reading and writing. If a file with the 
  14. #       same name already exists its content is erased and the file is 
  15. #       treated as a new empty file.
  16. #
  17. #   a+  Open a file for reading and appending. All writing operations are 
  18. #       performed at the end of the file, protecting the previous content 
  19. #       from being overwritten. 
  20. #
  21. #   You can reposition (fseek, rewind) the internal pointer to anywhere in the 
  22. #   file for reading, but writing operations will move it back to the end of 
  23. #   file. The file is created if it does not exist.
  24. ###
  25. File.open(local_filename, 'w') {|f| f.write(doc) }

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