Which command enables a user to exit the vi editor, overwriting the existing file without prompting for confirmation?（）

单项选择题User2 is complaining that he is unable to list the contents of a directory. What is the most likely cause?（）

A. User2 needs write permission to the directory.
B. User2 needs both read and write permissions to the directory.
C. User2 needs both read and execute permissions to the directory.
D. User2 needs both write and execute permissions to the directory.

单项选择题After making changes to the profile for an LPAR, the administrator asks the operator to bring the LPAR back up into a running state with the new changes. Which of the following is the correct way to do this?（）

A. Shutdown and activate the partition profile
B. Reboot the partition using the reboot command
C. Reboot the partition using the 'shutdown -r' command
D. Right click on the partition profile and select the 'apply changes' option

单项选择题Which of the following can be used to insert a new line below the current line inside a vi session?（）

A. o
B. a
C. p
D. A

单项选择题An operator is asked to rewind and eject a tape from a system. Which command will accomplish this without touching the tape drive?（）

A. tctl reset
B. tctl rewind
C. tctl return
D. tctl rewoffl

单项选择题When an operator is trying to log off the system displays this message: you have running jobs?? What does this mean?（）

A. One or more processes are running in the background, preventing log off.
B. One or more processes are paused, requiring operator input prior to logging off.
C. At least one process is running in the background and it will keep running after the operator logs off
D. At least one process is running in the background using nohup and it will terminate when the operator logs off