File Directory Ruby

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  4. 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