You have just added a CD.ROM drive （/dev/hdd） to your system and have added it to yourfstab. Typically you can use which of the following commands to mount media in that drive to /mnt/cdrom？（）

单项选择题Manypeoplelikethevitexteditorbutthedefaultbashcommandlineeditorrecognizesemacskeystrokes.Whatcommandenteredintoabashinitializationfilewillhavebashrecognizevikeystrokesafterlogin？（）

A. history-pvi
B. alias emacs=vi
C. HISTCMD=vi
D. set -o vi
E. unset emacs

单项选择题Whatinformationisdisplayedbythecommandcat proc dma？（）

A. whether DMA is enabled
B. which DMA channels are in use
C. which DMA mode is in use
D. general information about DMA on the machine

单项选择题WhichDebianpackagesystemcommandwilllistallpartiallyinstalledpackagesandsuggesthowtogetthemcorrectlyinstalled？（）

A. dpkg-G
B. apt-get-u
C. dpkg-Dh
D. dpkg-l
E. apt-get-y

单项选择题What is the output when the following shell script executes？（）   cat<；<；foobar   Hello foobar   foobar

A. The contents of the file foobar.
B. Hello
C. No output but a file named foobar is created.
D. Hello foobar
E. Hello foobar foobar

单项选择题WhichsystemadministrationcommandyoucanusetoupdateId.so.cacheaftertheinstallationofnewsharedlibraries？（）

A. Idconfig
B. Idd
C. libpath
D. newlibs