单项选择题 A System p administrator is reviewing root’s command history on a development server and finds that a junior adminstrator had been attempting to correct a full file system. One of the following commands caused damage that must be corrected.  Which command was it（）

单项选择题 The company auditors require a System p administrator to archive detailed information from each of their systems.  Which of the following commands will accomplish this task（）

单项选择题 A System p administrator is investigating a possible security breech and wants to review  information about failed login attempts to the system.  Which of the following commands will show this（）