How to determine Mac shutdown causes

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Determining Shutdown Causes

The previous shutdown causes in the timeframe you selected will appear as a list.
Common shutdown causes include 5 which indicates a normal shutdown, 3 which indicates a hard shutdown (i.e. holding the power button), and 0 which indicates the power was disconnected.
A list of shutdown causes can be found here: Shutdown causes (from George Garside blog)

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