What is an operating system?

An operating system (OS) is the Application Which, after being initially loaded into the computer by a boot program, oversees all the other application programs in a computer. The application programs make use of the working system by making Furthermore, users can interact directly with the operating system Via a user interface like a command line or a graphical user interface (GUI).

9 Popular Mobile Operating Systems

Android OS (Google Inc.) ...
2. Bada (Samsung Electronics) ...
BlackBerry OS (Research In Motion) ...
iPhone OS / iOS (Apple) ...
MeeGo OS (Nokia and Intel) ...
Palm OS (Garnet OS) ...
Symbian OS (Nokia) ...
webOS (Palm/HP) ...

Types of operating systems.

Operating systems normally include pre-loaded on almost any Computer you purchase. Many men and women use the operating system which comes with their computer, however it is possible to update or perhaps alter operating systems. The three most frequent operating systems for personal computers are Microsoft Windows, macOS, and Linux. A GUI enables you to use your mouse to click on icons, switches , and menus, and that which is clearly displayed on the display by means of a combo of images and text. Each operating system's GUI includes a different feel and look, so if you Switch to another operating system it might appear unfamiliar at first. However, modern operating systems have been made to be effortless to utilize , and the majority of the fundamental principles are exactly the same.

Microsoft established the Windows operating platform at the mid-1980s. There have been a number of distinct variants of Windows, but the latest ones are Windows 10 (published in 2015), Windows 8 (2012), Windows 7 (2009), along with Windows Vista (2007). Windows includes pre-loaded on many new PCs, which helps to ensure it is the hottest operating system on the planet.
Microsoft Windows
Microsoft established the Windows operating platform at the mid-1980s. There have been a number of distinct variants of Windows, but the latest ones are Windows 10 (published in 2015), Windows 8 (2012), Windows 7 (2009), along with Windows Vista (2007). Windows includes pre-loaded on many new PCs, which helps to ensure it is the hottest operating system on the planet.
MacOS (formerly called OS X) is a Lineup of operating systems made by Apple. It comes preloaded on all Macintosh computers, or Macs. A number of the specific models include Mojave (published in 2018), High Sierra (2017), and Sierra (2016). Based on StatCounter Global Stats, macOS users accounts for significantly less than 10 percent of international functioning systems--considerably lower than the percent of Windows users (greater than 80 percent ). 1 reason behind this is that Apple computers have a tendency to be costlier. But a lot of individuals do prefer the appearance and feel of macOS over Windows.
macOS
MacOS (formerly called OS X) is a Lineup of operating systems made by Apple. It comes preloaded on all Macintosh computers, or Macs. A number of the specific models include Mojave (published in 2018), High Sierra (2017), and Sierra (2016). Based on StatCounter Global Stats, macOS users accounts for significantly less than 10 percent of international functioning systems--considerably lower than the percent of Windows users (greater than 80 percent ). 1 reason behind this is that Apple computers have a tendency to be costlier. But a lot of individuals do prefer the appearance and feel of macOS over Windows.
Linux (pronounced LINN-ux) is a household of open-source operating systems, so they may be altered and distributed by all around the globe. This differs from proprietary program such as Windows, which may only be altered by the organization that owns it. The benefits of Linux are that it's free, and there are several different distributions or variations you may select from. Based on StatCounter Global Stats, Linux users accounts for under 2 percent of international functioning systems. But most servers run Linux since it's relatively simple to personalize.
Linux
Linux (pronounced LINN-ux) is a household of open-source operating systems, so they may be altered and distributed by all around the globe. This differs from proprietary program such as Windows, which may only be altered by the organization that owns it. The benefits of Linux are that it's free, and there are several different distributions or variations you may select from. Based on StatCounter Global Stats, Linux users accounts for under 2 percent of international functioning systems. But most servers run Linux since it's relatively simple to personalize.
The operating systems we have been speaking about so much were created to operate on desktop and notebook computers. Mobile apparatus like telephones , tablets , and MP3 players Are distinct from desktop and notebook computers, so that they run operating systems that have been designed especially for mobile devices. From the screenshot below, you can view iOS running in an iPad. Operating systems for mobile devices normally are not as fully featured As those created for desktop and notebook computers, and they are not capable to Run each the exact same software. But, you can still perform a Great Deal of things Together, like watch videos, browse the net, manage your calendarand play games.
Operating systems for mobile devices
The operating systems we have been speaking about so much were created to operate on desktop and notebook computers. Mobile apparatus like telephones , tablets , and MP3 players Are distinct from desktop and notebook computers, so that they run operating systems that have been designed especially for mobile devices. From the screenshot below, you can view iOS running in an iPad. Operating systems for mobile devices normally are not as fully featured As those created for desktop and notebook computers, and they are not capable to Run each the exact same software. But, you can still perform a Great Deal of things Together, like watch videos, browse the net, manage your calendarand play games.

Oliver Grawert: Building snap packages on Ubuntu Core

I actually wanted to move on with the node-red series of blog posts, but noticed that there is something more pressing to write down first …

People (on the snapcraft.io forum or IRC) often ask about “how would i build a package for Ubuntu Core” …

If your Ubuntu Core device is i.e. a Raspberry Pi you won’t easily be able to build for its armhf or arm64 target architecture on your PC which makes development harder.

You can use the snapcraft.io auto-build service that builds for all supported arches automatically or use fabrica but if you want to iterate fast over your code, waiting for the auto-builds is quite time consuming. Others i heard of simply have two SD cards in use, one running classic Ubuntu Server and the second one running Ubuntu Core so you can switch them around to test your code on Core after building on Server … Not really ideal either and if you do not have two Raspberry Pis this ends in a lot reboots, eating your development time.

There is help !

There is an easy way to do your development on Ubuntu Core by simply using an LXD container directly on the device … you can make code changes and quickly build inside the container, pull the created snap package out...


I actually wanted to move on with the node-red series of blog posts, but noticed that there is something more pressing to write down first …

People (on the snapcraft.io forum or IRC) often ask about “how would i build a package for Ubuntu Core” …

If your Ubuntu Core device is i.e. a Raspberry Pi you won’t easily be able to build for its armhf or arm64 target architecture on your PC which makes development harder.

You can use the snapcraft.io auto-build service that builds for all supported arches automatically or use fabrica but if you want to iterate fast over your code, waiting for the auto-builds is quite time consuming. Others i heard of simply have two SD cards in use, one running classic Ubuntu Server and the second one running Ubuntu Core so you can switch them around to test your code on Core after building on Server … Not really ideal either and if you do not have two Raspberry Pis this ends in a lot reboots, eating your development time.

There is help !

There is an easy way to do your development on Ubuntu Core by simply using an LXD container directly on the device … you can make code changes and quickly build inside the container, pull the created snap package out of your build container and install it on the Ubuntu Core host without any reboots or waiting for remote build services, just take a look at the following recipe of steps:

1) Grab an Ubuntu Core image from the stable channel, run through the setup wizard to set up user and network and ssh into the device:

$ grep Model /proc/cpuinfo 
Model       : Raspberry Pi 3 Model B Plus Rev 1.3
$ grep PRETTY /etc/os-release 
PRETTY_NAME="Ubuntu Core 18"
$

2) Install lxd on the device and set up a container targeting the release that your snapcraft.yaml defines in the base: entry (i.e. base: core -> 16.04, base: core18 -> 18.04, base: core20 -> 20.04):

$ snap install lxd
$ sudo lxd init --auto
$ sudo lxc launch ubuntu:18.04 bionic
Creating bionic
Starting bionic
$

3) Enter the container with the lxc shell command, install the snapcraft snap, clone your tree and edit/build your code:

$ sudo lxc shell bionic
root@bionic:~# snap install snapcraft --classic
...
root@bionic:~# git clone https://github.com/ogra1/htpdate-daemon-snap.git
root@bionic:~# cd htpdate-daemon-snap/
... make any edits you want here ...
root@bionic:~/htpdate-daemon-snap# snapcraft --destructive-mode
...
Snapped 'htpdate-daemon_1.2.2_armhf.snap'
root@bionic:~/htpdate-daemon-snap#

4) Exit the container, pull the snap file you built and install it with the –dangerous flag

root@bionic:~/htpdate-daemon-snap# exit
logout
$ sudo lxc file pull bionic/root/htpdate-daemon-snap/htpdate-daemon_1.2.2_armhf.snap .
$ snap install --dangerous htpdate-daemon_1.2.2_armhf.snap
htpdate-daemon 1.2.2 installed
$

This is it … for each new iteration you can just enter the container again, make your edits, build, pull and install the snap.

(One additional Note: if you want to avoid having to use sudo with all the lxc calls above, add your username to the end of the line reading lxd:x:999: in the /var/lib/extrausers/group file)

 


Read full article on Planet Ubuntu


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