Why does the following line break the terminal when executed in a non-interactive shell, but doesn't have the same effect when executed in an interactive shell?
for i in {1..10}; do sudo -u testuser echo & done ;wait
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1 Answer
Because the authors of sudo take special precautions to ensure that it sends prompts to, and receives input from, an actual interactive terminal.
This is sudo functioning as designed.
For more information, read man sudo sudoers.
For even more information, you can download, and read, the source.
sudo, or have you set up passwordless access to it for your user account?