What does if [ "${1}" == "pre" ]; do? Post: 303033197

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Operating Systems Linux Ubuntu What does if [ "${1}" == "pre" ]; do? Post 303033197 by drew77 on Monday 1st of April 2019 10:55:33 AM

04-01-2019

Registered User

man systemd-suspend.service

The documentation leaves much to be desired.

Code:

SYSTEMD-SUSPEND.SERVICE(8) systemd-suspend.service SYSTEMD-SUSPEND.SERVICE(8)

NAME
systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-sleep.service, systemd-suspend-then-hibernate.service, systemd-sleep - System
sleep state logic

SYNOPSIS
systemd-suspend.service

systemd-hibernate.service

systemd-hybrid-sleep.service

systemd-suspend-then-hibernate.service

/lib/systemd/system-sleep

DESCRIPTION
systemd-suspend.service is a system service that is pulled in by suspend.target and is responsible for the actual system suspend. Similarly,
systemd-hibernate.service is pulled in by hibernate.target to execute the actual hibernation. Finally, systemd-hybrid-sleep.service is pulled in by
hybrid-sleep.target to execute hybrid hibernation with system suspend and pulled in by suspend-then-hibernate.target to execute system suspend with
a timeout that will activate hibernate later.

Immediately before entering system suspend and/or hibernation systemd-suspend.service (and the other mentioned units, respectively) will run all
executables in /lib/systemd/system-sleep/ and pass two arguments to them. The first argument will be "pre", the second either "suspend",
"hibernate", "hybrid-sleep", or "suspend-then-hibernate" depending on the chosen action. Immediately after leaving system suspend and/or
hibernation the same executables are run, but the first argument is now "post". All executables in this directory are executed in parallel, and
execution of the action is not continued until all executables have finished.

Note that scripts or binaries dropped in /lib/systemd/system-sleep/ are intended for local use only and should be considered hacks. If applications
want to react to system suspend/hibernation and resume, they should rather use the Inhibitor interface[1].

Note that systemd-suspend.service, systemd-hibernate.service, and systemd-hybrid-sleep.service systemd-suspend-then-hibernate.service should never
be executed directly. Instead, trigger system sleep states with a command such as "systemctl suspend" or similar.

Internally, this service will echo a string like "mem" into /sys/power/state, to trigger the actual system suspend. What exactly is written where
can be configured in the "[Sleep]" section of /etc/systemd/sleep.conf or a sleep.conf.d file. See systemd-sleep.conf(5).

OPTIONS
systemd-sleep understands the following commands:

-h, --help
Print a short help text and exit.

--version
Print a short version string and exit.

suspend, hibernate, hybrid-sleep, suspend-then-hibernate
Suspend, hibernate, suspend then hibernate, or put the system to hybrid sleep.

SEE ALSO
systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7), systemd-halt.service(8)

NOTES
1. Inhibitor interface
https://www.freedesktop.org/wiki/Software/systemd/inhibit

systemd 237 SYSTEMD-SUSPEND.SERVICE(8)

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LEARN ABOUT SUSE

pm-is-supported

PM-IS-SUPPORTED(1)					       pm-utils User Manual						PM-IS-SUPPORTED(1)

NAME

       pm-is-supported - Test whether suspend or hibernate is supported.

SYNOPSIS

       pm-is-supported [{--suspend | --hibernate | --suspend-hybrid}]

DESCRIPTION

       This manual page documents briefly the pm-is-supported command.

       The intended purpose of pm-is-supported is to find out which power management modes are supported by the system. hald(8) will call it to do
       just that. (Note that DeviceKit-power does not use this.)

OPTIONS

       --suspend
	   Is suspend supported? Suspend is a state where most devices are shutdown, except for RAM. This state still draws power.

       --hibernate
	   Is hibernate supported? During hibernate the state of the system is saved to disk, the system is fully powered off.

       --suspend-hybrid
	   Is hybrid-suspend supported? Hybrid-suspend is the process where first the state of the system is saved to disk -- just like with
	   hibernate -- but instead of poweroff, the system goes in suspend state, which means it can wakeup quicker than for normal hibernation.
	   The advantage over suspend is that you can resume even if you run out of power. s2both is a hybrid-suspend implementation.

RETURN VALUE

       The result of the test for a certain powermanagement state is defined by the following exit codes.

       Code   Diagnostic
       0      State available.
       1      State NOT available.

SEE ALSO

       DeviceKit-power(7), hald(8), pm-suspend(8), s2both(8)

AUTHOR

       Tim Dijkstra <tim@famdijkstra.org>
	   Manpage author.

COPYRIGHT

       Copyright (C) 2007 Tim Dijkstra

       This manual page was originally written for the Debian(TM) system, and has been adopted by the pm-utils project.

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or (at
       your option) any later version published by the Free Software Foundation.

pm-is-supported 						   Apr 18, 2007 						PM-IS-SUPPORTED(1)