rtcwake --version (return code: 0)
rtcwake from util-linux 2.27.1
rtcwake --help (return code: 0)
Usage:
rtcwake [options]
Enter a system sleep state until a specified wakeup time.
Options:
-a, --auto reads the clock mode from adjust file (default)
-A, --adjfile <file> specifies the path to the adjust file
the default is /etc/adjtime
--date <timestamp> date time of timestamp to wake
-d, --device <device> select rtc device (rtc0|rtc1|...)
-n, --dry-run does everything, but suspend
-l, --local RTC uses local timezone
--list-modes list available modes
-m, --mode <mode> standby|mem|... sleep mode
-s, --seconds <seconds> seconds to sleep
-t, --time <time_t> time to wake
-u, --utc RTC uses UTC
-v, --verbose verbose messages
-h, --help display this help and exit
-V, --version output version information and exit
For more details see rtcwake(8).