Turn off delay circuit

Hi,

I'd like to design a circuit such that it is powered on by a short press of a switch, performs some action, and then turns itself off when it has done its purpose.

I suppose I could do this using a FET, but it has surely been done millions of times and I'd like not to reinvent the wheel. Could you give me a suitable example of such a circuit, or resources to inform me on the subject ?

Thanks.
.

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