position the file pointer 5 bytes from the end of the file and change the character to an X : seek « File Directory « Ruby

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Ruby » File Directory » seek   position the file pointer 5 bytes from the end of the file and change the character to an X IO::SEEK_CUR      Seeks a certain number of bytes ahead of the current position. IO::SEEK_END      Seeks to a position based on the end of the file.  IO::SEEK_SET      Seeks to an absolute position in the file. Identical to pos=. f = File.new("test.txt", "r+") f.seek(-5, IO::SEEK_END) f.putc "X" f.close   Related examples in the same category 1.  print every fifth character in a file:

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