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Documenting commands # or $ before sudo?
(feditown.com)
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Neither because it makes it hard to copy paste. If you have to pick one then $ because # is for comments in bash.
You can just get around this by using some css tricks to display the dollar and pound signs.
It's not actually part of the command, just some css to add the prefix visually.
That's OK then. If you can double click the text field the the prefix is not highlighted, then I'm happy :)