Which of the following commands or sequences of commands will rename a file x to file y in a Unix system?
I. mv y, x
II. mv x, y
III. cp y, x (rm x)
IV. cp x, y (rm x)
(A) II and III
(B) II and IV
(C) l and III
(D) II only
Answer: (B)
Explanation: I. mv y, x //will move contents of file x to file y
II. mv x, y //will move contents of file y to file x
III. cp y, x (rm x) //will copy file x to file y (removal of x after the command)
IV. cp x, y (rm x) //will move contents file y to file x (removal of x after the command)
Hence Answer B
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