A user reports that they cannot cd to /tmp/application. A system administrator entered the following command：  
（1）ls -ld /tmp/application  
（2）drw-r--r-- 4 root system 512 Jan 15 14：09 application  
What is the most likely cause of the problem？（）

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

A.The $VAR variable was not exported
B.The $VAR should have been set as VAR
C.dog needs double quotes around it when setting $VAR
D.The { } should not be around VAR in the echo command

单项选择题Review the following program. What is the possible problem？（）

A.#!/bin/ksh line is missing
B.Variable name VAR is not properly initialized
C.Loop variable is not incremented inside the loop
D.Loop variable is not decremented inside the loop

单项选择题Asystemadministratorhasaserverthatisperformingpoorly.ThevmstatcommandidentifiesthathighCPUusageistheproblem.Whichofthefollowingcommandscanbeusedtoidentifytheeightmostactiveprocessesrunningontheserver？（）

A.ps -ef -t8
B.sar -u -p 8
C.vmstat -t 8
D.topas -p8 -n0 -d0

单项选择题Asystemadministratorisunabletounmountafilesystem.Whichistheappropriatecommandtodeterminewhoorwhatisaccessingthefilesystem？（）

A.who /filesystem
B.lsfs /filesystem
C.fuser /filesystem
D.umount -f /filesystem

单项选择题Asystemadministratorwantstoconfigureasystemsothatallnewuserswillbeputintothedatabasegroupbydefault.Howwouldthisbeaccomplished？（）

A.remove all other groups from the system
B.run the command mkuser -default "GROUP=database"
C.change the default group in /usr/lib/security/mkuser.default
D.edit /etc/security/group to move all users to the database stanza