憩いの場

$ man rtcwake
NAME
  rtcwake - enter a system sleep state until specified wakeup time
...
  -l | --local
    Assumes that the hardware clock is set to local time,
    regardless of the contents of /etc/adjtime.
...
  -s seconds | --seconds seconds
    Sets the wakeup time to seconds in future from now.
  -t time_t | --time time_t
    Sets  the wakeup time to the absolute time time_t. time_t is the time 
    in seconds since 1970-01-01, 00:00  UTC.  Use  the  date(1) tool to 
    convert between human-readable time and time_t.
  -m mode | --mode mode
    Use standby state mode. Valid values are:
    standby
      ACPI state S1. This state offers minimal, though real, power savings, 
      while providing a very low-latency transition back to a working system. 
      This is the default mode.
    mem
      ACPI state S3 (Suspend-to-RAM). This state offers significant power 
      savings  as everything in the system is put into a low-power state,
      except for memory, which is placed in self-refresh mode to retain 
      its contents.
    disk
      ACPI state S4 (Suspend-to-disk). This state offers the greatest power
      savings, and can be used even in the absence of low-level platform support 
      for power management. This state operates similarly to Suspend-to-RAM,
      but includes a final step of writing memory contents to disk.
    off
      ACPI state S5 (Poweroff). This is done by calling '/sbin/shutdown'.
      Not officially supported by ACPI, but usually working.
    no
      Don't suspend. The rtcwake command sets RTC wakeup time only.
...

$ sudo rtcwake -m mem -s 3600

$ sudo rtcwake -m mem -l -t $(date +%s -d "2012-09-18 23:00")

12:18 am | コメントする |