單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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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