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Ans is C     mv command does not change inode and  i-node number  it is simply moving the file from one directory to other without retaining it in original location

An actual move (viz., a rename) is dramatically faster than the circuitous copy-and-move procedure. The file's i-number (short for "i-node number") does not change. No permission is required to read the file being moved insofar as—conceptually speaking—it is only cataloguing information that is being changed as a result of the "move." Since the source and target directories are being modified, to wit, entries are being created within the target directory and erased from within the source directory, "write" permission in both directories is required to complete the move. Moving files from one file system to another may fail entirely or may be automatically performed as a unific copy-and-delete action; the actual details are dependent upon the implementation.

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