Using "sed" to append to end of a file

The usual replacement for shell > with higher/different privileges is:

echo "replace file content with this line" | sudo tee protectedFile >/dev/null

And if you want to append, use -a:

echo "append this line to file" | sudo tee -a protectedFile >/dev/null

Whithout echo:

string=$'"<VirtualHost *:443> \
        ... \
    </VirtualHost>"'

sudo sed -i '$a\'"${string}"'' file

The -i option tells sed to process a files in-place (optionally adding a suffix to the original version).

The sed script:

It won't work on an empty file though (since there won't be any lines of input to match the last line).

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