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Nice, store todo.md in a cloud drive and you'll have it show up on all of your computers.

So you're storing a file on a public server that is beyond your control and you make your shell read it every time you launch it ?

What could possibly go wrong ?! ;-)

head just prints the contents of the file, it doesn't execute anything.

and neither does my terminal emulator...

Pipe it through something that strips control characters before printing perhaps?