How would a system administrator review root’s current cron jobs of the following？（）

A system administrator has an application that has the data in volume group appvg. Which of the following commands will back up the contents of appvg to the tape in /dev/rmt0 and check for any read errors？（）

A 1500 page print job was sent to the "pcl" queue. The job was running for several minutes before it was determined that the job was not needed. What can be done to delete the job？（）

A company uses raw logical volumes. Which command can be used to back up the data in the raw logical volumes to a tape？（）

Which command can a system administrator use to verify that a tape is in backup format and is readable by the system？（）

Given the following script， why does the output come out as an empty line instead of "dog"？（）

How does a system administrator add a new user to a system？（）

A user wants to be permanently added to the dba group. Which command or process can be used to accomplish this？（）

While installing an application， the administrator is instructed to perform two final tasks prior to starting the application：  1.Set the ownership of a file named ’control_file’ to be owned by the user ’database’ and the group ’appsrvr’.  2.Change the permissions of ’control_file’ to 0766.  After these two tasks have been completed， what will the file permissions look like when ’ls -l control_file’ is executed？（）

For security reasons， an administrator is asked to modify the system to prevent someone from leaving a terminal logged in. To enable a five minute timeout for all users， what would need to be done to accomplish this task？（）