rtcwake(8) - phpMan

rtcwake(8)                          Linux Programmer's Manual                          rtcwake(8)



NAME
       rtcwake - enter a system sleep state until specified wakeup time

SYNOPSIS
       rtcwake [-hvVlua] [-d device] [-m standby_mode] -t time_t | -s seconds

DESCRIPTION
       This program is used to enter a system sleep state until specified wakeup 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 ana-
       logues 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.

   Options
       -v | --verbose
              Be verbose.

       -h | --help
              Display a short help message that shows how to use the program.

       -V | --version
              Displays version information and exists.

       -a | --auto
              Reads  the clock mode (whether the hardware clock is set to UTC or local time) from
              /etc/adjtime. That's the location where the hwclock stores that information.

       -l | --local
              Assumes that the hardware clock is set to local time, regardless of the contents of
              /etc/adjtime.

       -u | --utc
              Assumes that the hardware clock is set to UTC (Universal Time Coordinated), regard-
              less of the contents of /etc/adjtime.

       -d device | --device device
              Uses 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.

       -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 tool to  convert  between  human-readable
              time and time_t.

       -m mode | --mode mode
              Use  standby  state  mode. Valid values are standby, mem, disk and on (no suspend).
              The default is standby.

HISTORY
       The program first appeared as kernel commit message  for  Linux  2.6  in  the  GIT  commit
       87ac84f42a7a580d0dd72ae31d6a5eb4bfe04c6d.

AVAILABILITY
       The  rtcwake  command  is  part  of  the  util-linux-ng  package  and  is  available  from
       ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

AUTHOR
       The program was written by David Brownell <david-b AT pacbell.net> and improved  by  Bernhard
       Walle <bwalle AT 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/licenses/gpl.html>.  There is NO WARRANTY, to
       the extent permitted by law.

SEE ALSO
       hwclock(8), date(1)



                                            2007-07-13                                 rtcwake(8)

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