Command Explanation

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How does the vim “write with sudo” trick work?

Many times I have found myself in a condition where I end up editing file in vi editor for which I don't have permission. So then we have to copy the content in some other file and copy it back to original file by changing the permissions. But I have found one solution through searching web that we can give command :w !sudo tee % and there is no need for copying back and forth. Can anybody explain how this is working !!

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Let's see...

:w !{cmd}

executes {cmd} , feeding the current buffer into its standard input.

Here, {cmd} is sudo tee % . This executes tee {filename} as root , where {filename} is the name of the file you're editing. The command writes its standard input (ie the contents of the vim buffer) into the file, as root .

Neat trick, BTW.

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You're writing the file to the STDIN of the command:

sudo tee %

sudo escalates your permissions and tee writes STDIN to the file (% is replaced by the current filename by vim before executing the command)

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