A.dog catB.dog fishC.mouse catD.mouse fishGiven the fol……

单项选择题Howcanpermissionsbesetupon tmpsothatausercannotdeleteanotheruser’sfiles？（）

A.chmod +s /tmp
B.chmod 775 /tmp
C.chmod 1777 /tmp
D.chmod 4755 /tmp

单项选择题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？（）

A.-rwxrw-rw- 1 database appsrvr 4913 Mar 17 08：24 control_file
B.-rw-r--r-- 1 appsrvr database 4913 Mar 17 08：24 control_file
C.-rw-r--r-- 1 database appsrvr 4913 Mar 17 08：24 control_file
D.-rwxrw-rw- 1 appsrvr database 4913 Mar 17 08：24 control_file

单项选择题Asystemadministratorwantstogivefullread write excuteaccesstotheownerandgroupofthe stuffdirectoryandallsubdirectoriesandfiles，butonlyallowread executeforothers.Whatcommandwouldtheadministratoruse？（）

A.chmod -R 775 /stuff
B.chmod -h 002 /stuff
C.chmod -R 577 /stuff
D.chmod ug+rwx，o+rx /stuff

单项选择题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？（）

A.The /tmp/application should be globally writable.
B.The /tmp/application directory should be executable.
C.The /tmp/application directory should be owned by the user.
D.The /tmp/application directory should have the sticky bit set.

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