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If I give this command for shutting down the system:

$ sudo shutdown -h 10:20 "going down"

how can I abort it?

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up vote 9 down vote accepted

As we can read from manual page man shutdown

       Cancel a pending shutdown. This may be used cancel the effect of an
       invocation of shutdown with a time argument that is not "+0" or "now".
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You can use Ctrl + c to cancel the running shutdown.

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