[理学]UNIX试卷及课后习题与答案.doc

试卷A 一、单项选择题（在每小题的备选答案中，选出正确的答案。请将答案填写在答题纸上，每小题1分，共20分）1. You want to save vi changes to the file myfile with : w!. but vi complains it can not write to the file. Therefore, you want to check the write permissions on the file. To do this without leaving vi, you type: A. :!ls -l myfile B. :\s -l myfile C. esc:ls -l myfile D. :?ls -l myfile 2. What is the proper option to put in /etc/fstab to enable user quotas for a particular partition? A. usrquota B. userquota C. userquoatas D. usrquotas 3. Which of the following commands would display the lines containing capital letters from the file turkey.txt ? A. cat turkey .txt |wc - | B. grep -n [A-Z] turkey.txt C. cat turkey.tst |wc -w [A-Z] D. grep -v [A-Z] turkey.txt E. for [A-Z] in turkey.txt I count 4. What run level represents multi-user? A. 3 B. 0 C. 1 D. 5 5. Which of the following can be used to switch your system to run level 1? A. init 1 B. inittab 1 C. rlevel 1 D. level 1 6. What would the following line accomplish if run as root? chown -R bert /home/bert/* A. Nothing, this command is invalid. B. It would revoke berts ownership from his home directory to root. C. It would change user ownership of all files in /home/bert to bert. D. It would set the group ownership of the directory /home/bert to bert. E. It would set ownership of all files and subdirectories in /home/bert to bert. 7. If you set the umask to 022, by default what permissions will your files have? A. 0220 B. 0557 C. 0644 D. 0755 8. What are the default permissions for the Red Hat /etc/passwd file? A. 644 B. 640 C. 400 D. 641 E. 440 9. How can you set the SGID on a file called happylinuxexaminator? A. chmod u+s happylinuxexaminator B. chmod g+s happylinuxexaminator C. chmod o+s happylinuxexaminator D. chmod u+t happylinuxexaminator 10. Which one of the following programs will only find file