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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what-patch

WHAT-PATCH(1)						      General Commands Manual						     WHAT-PATCH(1)

NAME

       what-patch - detect which patch system a Debian package uses

SYNOPSIS

       what-patch [options]

DESCRIPTION

       what-patch examines the debian/rules file to determine which patch system the Debian package is using.

       what-patch should be run from the root directory of the Debian source package.

OPTIONS

       Listed below are the command line options for what-patch:

       -h, --help
	      Display a help message and exit.

       -v     Enable verbose mode.  This will include the listing of any files modified outside or the debian/ directory and report any additional
	      details about the patch system if available.

AUTHORS

       what-patch was written by Kees Cook <kees@ubuntu.com>, Siegfried-A. Gevatter <rainct@ubuntu.com>, and  Daniel  Hahler  <ubuntu@thequod.de>,
       among others.  This manual page was written by Jonathan Patrick Davies <jpds@ubuntu.com>.

       Both are released under the GNU General Public License, version 3 or later.

SEE ALSO

       The Ubuntu MOTU team has some documentation about patch systems at the Ubuntu wiki: https://wiki.ubuntu.com/PackagingGuide/PatchSystems

       cdbs-edit-patch(1), dbs-edit-patch(1), dpatch-edit-patch(1)

DEBIAN
								 Debian Utilities						     WHAT-PATCH(1)