单项选择题
Which of the following commands can an operator use to view disk performance details?()
	A. topas -D
	B. topas -R
	C. topas -C
	D. topas -d
                    
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 An operator is editing a file using vi. Which of the following subcommand sequences will copy the current line plus the next 2 lines to the end of the file?()
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                                    单项选择题
                                    
 How can an operator temporarily gain access to the command line while in a smit session, without losing the current smit session?()
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 Which of the following commands will display, in MB, the total, used, and free blocks of the currently mounted filesystems?()
 A. df -m 
 B. du -m
 C. df -vm
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