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In fish shell, with bob-the-fish theme[1] and powerline fonts, my prompt ends in ``. Gives a nice appearance, and definitely isn't a valid redirect.
Of course anyone who does manage to paste and execute code as root (or with sudo in the line) in a terminal without sanitizing it is careless, as long as their terminal doesn't have the stupid right-click-paste behavior. If it does, I agree with the author that it's just a bad terminal.
[1] https://github.com/oh-my-fish/theme-bobthefish
This is the real solution! I think every shell supports "safe paste" in some way. For example, here's something for Zsh: https://github.com/ohmyzsh/ohmyzsh/blob/master/plugins/safe-...
This works great in combination with another advanced feature, "edit command" or "edit and execute command". Once you've pasted a command into the terminal, even a multiline command with safe paste, you can have the shell open your $EDITOR to edit the command, and automatically put the result right back into the shell (or just run it). This is available in Bash by default as ctrl-x ctrl-e.