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单项选择题 An administrator needs to add the /usr/vac/bin directory to their PATH environment variable for the current session.  Which of the following will accomplish this task（）

A、path=$path：/usr/vac/bin； export path

B、path.=/usr/vac/bin； export $path

C、Modify the path environment variable in /etc/profile

D、Modify the path environment variable in /.profile

  • A

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