In vi, which command is used to undo the last command?
A. u
B. z
C. Z
D. Ctrl + Z
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In vi, which command is used to delete the current line?
A. dd
B. dl
Ctrl + Y
D. dline
In vi, which key is used to change from input mode to command mode?
A. F12
B. Ctrl + F7
C. ESC
D. ENTER
Which of these is not true about vi?
A. You can search text in vi
B. You can edit multiple file simultaneously in vi
C. You can use regular expression in vi
D. You can find vi in almost every Unix installation
有inta[4]={5,3,8,9};则其中a[3]的值为()
A. 5
B. 3
C. 8
D. 9
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