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单选题
Which command enables a user to exit the vi editor, overwriting the existing file without prompting for confirmation?（）
A
:w
B
:qw
C
:x!
D
:we!
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Which command enables a user to exit the vi editor, overwriting the existing file without prompting for confirmation?()
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单选题Which action changes the default editor for ALL users on the system from vi to edit of the following？（）A
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ecB
wcC
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Login as the user and run 'echo $ENV'.B
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[edit chassis]user@router#B
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user@router
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HISTCMD=viD
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unset emacs
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Issue the command： export EDITOR=/usr/bin/edit edit each user .profile to change the EDITOR value to /usr/bin/editB
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Modify /etc/environment and add EDITOR=/usr/bin/edit export EDITORD
Modify /etc/security/defaults and change the EDITOR value to /usr/bin/edit
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