单项选择题
Which command enables a user to exit the vi editor, overwriting the existing file without prompting for confirmation?（）
A. :w
B. :qw
C. :x!
D. :we!
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A. User2 needs write permission to the directory.
B. User2 needs both read and write permissions to the directory.
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Which of the following can be used to insert a new line below the current line inside a vi session?（）
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