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    Thank you. Though informative, this answer does not contain the answer to the question.
    – dotancohen
    Commented Jun 5, 2014 at 9:01
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    The answer is hidden in the second paragraph: ^M is shorthand for Control-M. On the terminal you would press the Control key together with the M key to send the ASCII kode 0x0D also known as a carriage return. Commented Jun 6, 2014 at 4:02