tldr/pages/linux/rtcwake.md

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# rtcwake
> Enter a system sleep state until specified wakeup time relative to your bios clock.
- 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 linux > 3.9 required) and wakeup at a given date and time:
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`sudo rtcwake -m freeze --date {{YYYYMMDDhhmm}}`
- Disable a previously set alarm:
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`sudo rtcwake -m disable`
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- Perform a dry run to wakeup the computer at a given time. (Press Ctrl + C to abort):
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`sudo rtcwake -m on --date {{hh:ss}}`