Update cheatsheets

linux/rtcwake

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rtcwake
+
+> Enter a system sleep state until specified wakeup time relative to your BIOS clock.
+> More information: <https://manned.org/rtcwake>.
+
+- 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}}`