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







   systemd-suspend.service is a system service that is pulled in by and is responsible for the actual system suspend.
   Similarly, systemd-hibernate.service is pulled in by
   to execute the actual hibernation. Finally,
   systemd-hybrid-sleep.service is pulled in by to
   execute hybrid hibernation with system suspend.

   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", or "hybrid-sleep" 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 be notified of system suspend/hibernation and
   resume, there are much nicer interfaces available.

   Note that systemd-suspend.service, systemd-hibernate.service, and
   systemd-hybrid-sleep.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-


   systemd-sleep understands the following commands:

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

       Print a short version string and exit.

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


   systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7),


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.