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 Ruby: File I/O

File.open(<filename>, <mode>)

Modes:

• r = read only
• r+ = read/write
• w = write only - creates a new file, or replaces an existing file
• w+ = read/write - creates a new file, or replaces an existing file
• a = write only - appends to end of existing file, or creates new file
• a+ = read/write - appends to end of existing file, or creates new file
• b = binary - DOS/Windows only - binary mode, may appear with any of the above.

File.open opens the file if no block is given. If a block is given, the file is passed to the block as an argument, and the file is closed when the block terminates.

File::seek(<offset>)

Offsets:

• IO::SEEK_CUR - Seeks to first integer number parameter plus current position
• IO::SEEK_END - Seeks to first integer number parameter plus end of stream (you probably want a negative value for first integer number parameter)
• IO::SEEK_SET - Seeks to the absolute location given by first integer number parameter

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Notebook exported on Monday, 7 July 2008, 18:56:06 PM Eastern Daylight Time