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- [Instructor] Say you're writing some Python code,

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vim hello.py.

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You decided to license your code under the Apache license.

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I need to add a header to every file.

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An easy solution is to write such a header

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and then read it into a file.

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To read the file, use :r.

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Since :r inserts the text under the current line,

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we first need to insert a new line.

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So, Shift + o and then escape

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and then :r and license header.txt and end.

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And now the delete the new line.

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So, K to move one line up and DD to remove the line.

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You can make it simpler if you use a motion command.

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We can use the minus one line, the previous line,

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as the location to insert the new line.

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Let's undo with :e! and enter.

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This will reload the file from the disk

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disregarding any changes we made to it.

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And now, :-1 and then read

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and then license header.txt and enter.

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If you start to find imperfects and hit Tab

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vim will complete the name for you.

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So, :-1r li and tab and we got the file name.