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I usually do the opposite and add a --really flag to my CLI utilities, so that they are read-only by default and extra effort is needed to screw things up.

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I've committed "--i-meant-that" (for a destroy-the-remote-machine command that normally (without the arg) gives you a message and 10s to hit ^C if you're not sure, for some particularly impatient coworkers. Never ended up being used inappropriately, which is luck (but we never quantified how much luck :-)

I like the timer idea. I do something kinda similar by prompting the user to enter some short random code to continue.

I guess the goal for both is to give the user a chance to get out of autopilot, and avoid up-arrowing and re-executing.

Came here to say the same

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