read(...) public

Opens the file, optionally seeks to the given offset, then returns length bytes (defaulting to the rest of the file). read ensures the file is closed before returning.

   IO.read("testfile")           #=> "This is line one\nThis is line two\nThis is line three\nAnd so on...\n"
   IO.read("testfile", 20)       #=> "This is line one\nThi"
   IO.read("testfile", 20, 10)   #=> "ne one\nThis is line "
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