The above is a shell app.
You can list the files in the current file (the shell app itself) by running ls. It is empty, don’t be surprised :) Just so you know it is the context.
The above is the equivalent of q * which stands for query children.
There is a hidden markdown file on this page. It is just like this one, except it is in a different placeholder, so the page doesn’t display it. Em, which placeholder?
Run q ../:1 to see what is in placeholder 1.
Run q ../:0 to see what is in placeholder 0. As you will see the lost markdown file is here, let’s move it in placeholder 1.
We will use the mv command, let’s see how it works. Type mv --help.
Okay, we have two options. Either we explicitly move the lost markdown file to the end of placeholder 1, via mv ../lost-markdown.md append .. 1, or we can use the fact that this very markdown is in the right place, and place it after this one using mv ../lost-markdown.md after ../md.md.
This is the very command that is run when you drop around files with your mouse. See for yourself in the Network tab of your browser’s developer tools.