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單項(xiàng)選擇題

What command would an operator use to move a file from the /old_dir directory to the /new_dir directory without changing the file name?（）

A. mv /old_dir/file /new_dir
B. mv -p /old_dir/file /new_dir
C. mv -k /old_dir/file /new_dir
D. mv /old_dir/file /new_dir/new_file

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Which of the following commands will show the users that are logged on a system ?（）

A. id
B. who
C. whois
D. lsuser

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An Operator is in /var/tmp and needs to go to /var/adm. Which of the following is correct?（）

A. cd /adm
B. cd ./adm
C. cd ../adm
D. cd /../adm