单项选择题

Which of the following commands can be used to gain root privileges and profile without initially logging in as root?()

A. su 
B. su root 
C. su - root 
D. su -c "root"

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热门 试题

单项选择题
WhichofthefollowingisTRUEabouterrorprocessing?()

A.The error daemon runs in the foreground and reads the /etc/errpt file. 
B.The error daemon is invoked by the user when required and it reads the /usr/lib/errpt. 
C.The error daemon is invoked whenever the error occurs and it reads the /usr/lib/errpt. 
D.The error daemon /usr/lib/errdemon runs in the background on most machines and reads the /dev/error special file.

单项选择题
AllofthefollowingclassesoferrorsareloggedintheerrorreportEXCEPT().

A. Messages 
B. Software 
C. Hardware 
D. Unknown

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