Linux sudo bang bang 到底是什么？
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What exactly is sudo bang bang?
提问by alestanis
What is the purpose of sudo bang bang (sudo !!) and when might one need to use it?
sudo bang bang ( sudo !!)的目的是什么，什么时候需要使用它？
采纳答案by alestanis
The bang bang (!!) command is a shortcut to repeat the previous command you entered in your terminal. This command is very useful when you forget that you need admin rights to make a certain action, and lets you repeat it with super-user rights just by typing
bang bang( !!) 命令是重复您在终端中输入的上一个命令的快捷方式。当您忘记执行某个操作需要管理员权限时，此命令非常有用，并且只需键入即可让您以超级用户权限重复该命令
sudo !!
instead of typing arrow-up, scrolling to the beginning of the line, adding sudoand hitting enter (imagine scrolling through those loooongapt-getcommands). So many seconds gained! Yay!
而不是键入向上箭头，滚动到行首，添加sudo并按回车键（想象一下滚动这些loooongapt-get命令）。获得了这么多秒！好极了！
There are many other bang-commands such as !x, !?x, !!:pand !!*. This blog postlists them and explains what they are for.
还有许多其他爆炸的命令，例如!x，!?x，!!:p和!!*。这篇博文列出了它们并解释了它们的用途。
