What command will pr...

单项选择题What command will print a list of usernames （first column） and their corresponding user id （uid， third column） from /etc/passwd？（）

A. cut -d： -f 1，3 /etc/passwd
B. chop -c 1，3 /etc/passwd
C. tac 1-3/etc/passwd
D. fmt -u /etc/passwd

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1.单项选择题In xorg.conf， which section is concerned with fonts？（）

A. the Fonts section
B. the Files section
C. the xfsCodes section
D. the Graphics section
E. the modeline section

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2.单项选择题 Given the following output： prompt> myapp
[1]+ Stopped myapp prompt>
Which of the following commands will resume executing the stopped process while allowing the user to continue to type commands at the command prompt？（）

A. bg myapp
B. continue myapp
C. exec myapp
D. fg myapp
E. myapp &

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3.单项选择题To allow a regular user account to mount and unmount a filesystem （for instance， a cdrom or floppy）， which option need to be added to the corresponding line in /etc/fstab？（）

A. nouidchk
B. alluser
C. user
D. auto

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4.填空题Which program finds only files that are in your PATH？（）

参考答案：/USR/BINyWHICH

5.多项选择题What does the Filesystem Hierarchy Standard enable？（）

A. software to predict the location of installed files and directories
B. software to predict the ownership and access rights to files and directories
C. users to predict the location of installed files and directories
D. users to predict how the filesystem should be formatted according to need

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6.单项选择题You are looking for an executable file foo. Select the command that would search forfoo within directories set in the shell variable， PATH.（）

A. locate
B. which
C. find
D. query
E. whereis

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7.单项选择题Which of these commands allows you to use shared libraries that are in /usr/local/lib？（）

A. export LD_PRELOAD=/usr/local/lib
B. export LD_LIBRARY_PATH=/usr/local/lib
C. Idconfig /usr/local/lib
D. Idd/usr/local/lib

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8.单项选择题Using vi， you want to save changes to the file myfile with ：w!， but vi complains it cannot 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-I myfile
B. ：\ls-l myfile
C. esc ：Is -I myfile
D. ：？ls-l myfile

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9.单项选择题You wish to kill a process with a PID of 123. Select the command which exiting.（）

A. kill-1 123
B. kill-9 123
C. kill-15 123
D. kill-17 123

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10.单项选择题Which of the following commands will change all CR-LF pairs in an imported text file， userlist.txt， to Linux standard LF characters and store it as newlist.txt？（）

A. tr ’\r\n’ " < userlist.txt > newlist.txt
B. tr -c ’\n\r’ " < newlist.txt > userlist.txt
C. tr -d \r¯ < userlist.txt > newlist.txt
D. tr \r¯\n¯ userlist.txt newlist.txt
E. tr -s ®^M’¡®^J’ userlist.txt newlist.tx

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