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What is the purpose of sudo bang bang (sudo !!) and when might one need to use it?
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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 typinginstead 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!There are many other bang-commands such as
!x,!?x,!!:pand!!*. This blog post lists them and explains what they are for.