Using `bootctl set-default @current` will set the default loader entry to the currently booted entry as read from the `LoaderEntrySelected` EFI variable. Also `bootctl set-oneshot @current` will set the oneshot loader entry to the current booted entry. Correspondingly `@default` and `@oneshot` can be used to read from the LoaderEntryDefault and LoaderEntryOneshot EFI variables.
System and Service Manager
Details
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Please see the Hacking guide for information on how to hack on systemd and test your modifications.
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Stable branches with backported patches are available in the stable repo.