rtcwake

Enter a system sleep state until specified wakeup time relative to your BIOS clock.

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• Show whether an alarm is set or not:

sudo rtcwake -m show -v

• Suspend to RAM and wakeup after 10 seconds:

sudo rtcwake -m mem -s {10}

• Suspend to disk (higher power saving) and wakeup 15 minutes later:

sudo rtcwake -m disk --date +{15}min

• Freeze the system (more efficient than suspend-to-RAM but version 3.9 or newer of the Linux kernel is required) and wakeup at a given date and time:

sudo rtcwake -m freeze --date {YYYYMMDDhhmm}

• Disable a previously set alarm:

sudo rtcwake -m disable

• Perform a dry run to wakeup the computer at a given time. (Press Ctrl + C to abort):

sudo rtcwake -m on --date {hh:ss}

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