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RTCWAKE(8)                   System AdministrationRTCWAKE(8)NAME       rtcwake - enter a system sleep state until specified wakeup timeSYNOPSIS       rtcwake [options] [-d device] [-m standby_mode] {-s seconds|-t time_t}DESCRIPTION       This program is used to enter a system sleep state and to automatically       wake from it at a specified time.       This uses cross-platform Linux  interfaces  to  enter  a  system  sleep       state,  and  leave  it no later than a specified time.  It uses any RTC       framework driver that supports standard driver model wakeup flags.       This is normally used like the old apmsleep utility,  to  wake  from  a       suspend  state  like  ACPI  S1  (standby) or S3 (suspend-to-RAM).  Most       platforms can implement those without analogues of BIOS, APM, or ACPI.       On some systems, this can also be used like nvram-wakeup,  waking  from       states like ACPI S4 (suspend to disk).  Not all systems have persistent       media that are appropriate for such suspend modes.       Note that alarm functionality depends on hardware;  not  every  RTC  is       able to setup an alarm up to 24 hours in the future.       The  suspend  setup  may be interrupted by active hardware; for example       wireless USB input devices that continue to send events for some  frac-       tion  of  a  second  after the return key is pressed.  rtcwake tries to       avoid this problem and it waits to terminal to settle down  before  en-       tering a system sleep.OPTIONS       -A, --adjfile file              Specify an alternative path to the adjust file.       -a, --auto              Read the clock mode (whether the hardware clock is set to UTC or              local time) from the adjtime file, wherehwclock(8) stores  that              information.  This is the default.       --date timestamp              Set  the  wakeup  time to the value of the timestamp.  Format of              the timestamp can be any of the following:              YYYYMMDDhhmmss              YYYY-MM-DD hh:mm:ss              YYYY-MM-DD hh:mm     (seconds will be set to 00)              YYYY-MM-DD           (time will be set to 00:00:00)              hh:mm:ss             (date will be set to today)              hh:mm                (date will be set to today, seconds to 00)              tomorrow             (time is set to 00:00:00)              +5min       -d, --device device              Use the specified device instead  of  rtc0  as  realtime  clock.              This  option  is  only relevant if your system has more than one              RTC.  You may specify rtc1, rtc2, ... here.       -l, --local              Assume that the hardware clock is set to local time,  regardless              of the contents of the adjtime file.       --list-modes              List available --mode option arguments.       -m, --mode mode              Go into the given standby state.  Valid values for mode are:              standby                     ACPI  state  S1.  This state offers minimal, though real,                     power savings, while providing a very low-latency transi-                     tion back to a working system.  This is the default mode.              freeze The  processes  are frozen, all the devices are suspended                     and all the processors idled.  This state  is  a  general                     state  that  does not need any platform-specific support,                     but it saves less power than Suspend-to-RAM, because  the                     system  is  still  in  a running state.  (Available since                     Linux 3.9.)              mem    ACPI state S3 (Suspend-to-RAM).  This state  offers  sig-                     nificant 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  ab-                     sence of low-level platform support for power management.                     This state operates similarly to Suspend-to-RAM, but  in-                     cludes 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                     it usually works.              no     Don't suspend, only set the RTC wakeup time.              on     Don't  suspend,  but  read  the RTC device until an alarm                     time appears.  This mode is useful for debugging.              disable                     Disable a previously set alarm.              show   Print  alarm  information  in  format:   "alarm:   off|on                     <time>".   The  time  is  in  ctime() output format, e.g.                     "alarm: on  Tue Nov 16 04:48:45 2010".       -n, --dry-run              This option does everything apart from actually setting  up  the              alarm, suspending the system, or waiting for the alarm.       -s, --seconds seconds              Set the wakeup time to seconds in the future from now.       -t, --time time_t              Set  the wakeup time to the absolute time time_t.  time_t is the              time in seconds since 1970-01-01, 00:00 UTC.   Use  thedate(1)              tool to convert between human-readable time and time_t.       -u, --utc              Assume that the hardware clock is set to UTC (Universal Time Co-              ordinated), regardless of the contents of the adjtime file.       -v, --verbose              Be verbose.       -V, --version              Display version information and exit.       -h, --help              Display help text and exit.NOTES       Some PC systems can't currently exit sleep states  such  as  mem  using       only  the  kernel  code  accessed  by this driver.  They need help from       userspace code to make the framebuffer work again.FILES       /etc/adjtimeHISTORY       The program was posted several times on LKML and other lists before ap-       pearing  in  kernel  commit  message  for  Linux  2.6 in the GIT commit       87ac84f42a7a580d0dd72ae31d6a5eb4bfe04c6d.AUTHORS       The program was  written  by  David  Brownell  <dbrownell@users.source-       forge.net> and improved by Bernhard Walle <bwalle@suse.de>.COPYRIGHT       This  is  free  software.   You may redistribute copies of it under the       terms  of  the  GNU  General  Public  License   <http://www.gnu.org/li-       censes/gpl.html>.   There  is  NO  WARRANTY, to the extent permitted by       law.SEE ALSOhwclock(8),date(1)AVAILABILITY       The rtcwake command is part of the util-linux package and is  available       from  the  Linux Kernel Archive <https://www.kernel.org/pub/linux/utils       /util-linux/>.util-linux                         June 2015RTCWAKE(8)