the bourne shell, bourne-again shell, and korn shell notation digit1_&digit2

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the bourne shell, bourne-again shell, and korn shell notationdigit1_&digit2says to redirect descriptor digit1 to the same file as descriptor digit2. what is the difference between the two commands shown below? (hint: the shells process their command lines from left to right.)./a.out _ outfile 2_&1./a.out 2_&1 _ outfile
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