A system administrator&#81...

单项选择题A system administrator wants to run a script called myscript， but does not want to see the errors that might be generated by the script. How would this be accomplished？（）

A./usr/local/bin/myscript > /dev/null
B./usr/local/bin/myscript < /dev/null
C./usr/local/bin/myscript 2> /dev/null
D./usr/local/bin/myscript 1> /dev/null

点击查看答案

您可能感兴趣的试卷

你可能感兴趣的试题

1.单项选择题Which command will run myscript and redirect stdout and sterr to /tmp/myoutput？（）

A../myscript >> /tmp/myoutput
B../myscript 2>&1 /tmp/myoutput
C../myscript > /tmp/myoutput 2>&1
D../myscript > /tmp/myoutput &1>2

点击查看答案

2.单项选择题A user’s print jobs default to PRINTER_A.The user wants to change their default printer to PRINTER_B.How can the system administrator change the user’s default printer to PRINTER_B？（）

A.Execute the command ’piobe -q PRINTER_B’
B.Edit the user’s stanza in the /etc/qconfig file
C.Execute the command ’chuser -a QUEUE=PRINTER_B user’
D.Add the line ’export PRINTER=PRINTER_B’ to the user’s .profile

点击查看答案

3.单项选择题 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.kill 201
B.cancel 201
C.disable pcl
D.rm /var/spool/lpd/STDIN.27648

点击查看答案

4.单项选择题 Given the following scripts， what output would be generated？（）

A.The sky is red.
B.The sky is blue.
C.The sky is green.
D.The sky is yellow.

点击查看答案

5.单项选择题 Given the following scripts， both found in /usr/local/bin， what would the output be when executing /usr/local/bin/script1？（）

A.dog cat
B.dog fish
C.mouse cat
D.mouse fish

点击查看答案

6.单项选择题How can permissions be set up on /tmp so that a user cannot delete another user’s files？（）

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

点击查看答案

7.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

点击查看答案

8.单项选择题A system administrator wants to give full read/write/excute access to the owner and group of the /stuff directory and all subdirectories and files， but only allow read/execute for others. What command would the administrator use？（）

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

点击查看答案

9.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.

点击查看答案

10.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

点击查看答案