RTCWAKE(8) RTCWAKE(8) rtcwake - . rtcwake [] [-d ] [-m _] {-s |-t _t} . Linux . , . , , apmsleep , ACPI S1 () S3 ( '). BIOS, APM ACPI. nvram-wakeup, , ACPI S4 ( ). . Note that alarm functionality depends on hardware; not every RTC is able to set up an alarm up to 24 hours in the future. . , USB, Enter. rtcwake , . -A, --adjfile . -a, --auto (, ) adjtime, hwclock(8) . . --date - Set the wakeup time to the value of this timestamp. The format of timestamp can be any of the following: YYYYMMDDhhmmss "YYYY-MM-DD hh:mm:ss" "YYYY-MM-DD hh:mm" (seconds is 00) YYYY-MM-DD (time is 00:00:00) hh:mm:ss (date is today) hh:mm (date is today, seconds is 00) +number[smhd] (seconds/minutes/hours/days after now) tomorrow (time is 00:00:00) Examples of the +number[smhd] format are: +5m, +6h, +2d. The unit specifier may be longer: +5min, +6hours, +2days. -d, --device rtc0, . , . rtc1, rtc2... -l, --local , , adjtime. --list-modes --mode. -m, --mode . : standby S1 ACPI. , , , . . freeze , , . , - , , ', . ( Linux 3.9.) mem S3 ACPI ( '). , , ', , . disk S4 ACPI ( ). , , . ', ' . off S5 ACPI (). <>. ACPI , , , . no , . on , , . . disable . show Print alarm information in format: "alarm: off|on