Friday, January 13, 2017
What is Linux?
For the purposes of this page, we use the term “Linux” to refer to the Linux kernel, but also the set of programs, tools, and services that are typically bundled together with the Linux kernel to provide all of the necessary components of a fully functional operating system. Some people, particularly members of the Free Software Foundation, refer to this collection as GNU/Linux, because many of the tools included are GNU components. However, not all Linux installations use GNU components as a part of their operating system. Android, for example, uses a Linux kernel but relies very little on GNU tools.
How does Linux differ from other operating systems?
In many ways Linux is similar to other operating systems you may have used before, such as Windows, OS X, or iOS. Like other operating systems, Linux has a graphical interface, and types of software you are accustomed to using on other operating systems, such as word processing applications, have Linux equivalents. In many cases, the software’s creator may have made a Linux version of the same program you use on other systems. If you can use a computer or other electronic device, you can use Linux.But Linux also is different from other operating systems in many important ways. First, and perhaps most importantly, Linux is open source software. The code used to create Linux is free and available to the public to view, edit, and—for users with the appropriate skills—to contribute to.
Linux is also different in that, although the core pieces of the Linux operating system are generally common, there are many distributions of Linux, which include different software options. This means that Linux is incredibly customizable, because not just applications, such as word processors and web browsers, can be swapped out. Linux users also can choose core components, such as which system displays graphics, and other user-interface components.
What is the difference between Unix and Linux?
Who uses Linux?
You’re probably already using Linux, whether you know it or not. Depending on which user survey you look at, between one- and two-thirds of the webpages on the Internet are generated by servers running Linux.Companies and individuals choose Linux for their servers because it is secure, and you can receive excellent support from a large community of users, in addition to companies like Canonical, SUSE, and Red Hat, which offer commercial support.
Many of the devices you own probably, such as Android phones, digital storage devices, personal video recorders, cameras, wearables, and more, also run Linux. Even your car has Linux running under the hood.
Who “owns” Linux?
By virtue of its open source licensing, Linux is freely available to anyone. However, the trademark on the name “Linux” rests with its creator, Linus Torvalds. The source code for Linux is under copyright by its many individual authors, and licensed under the GPLv2 license. Because Linux has such a large number of contributors from across multiple decades of development, contacting each individual author and getting them to agree to a new license is virtually impossible, so that Linux remaining licensed under the GPLv2 in perpetuity is all but assured.How was Linux created?
Linux was created in 1991 by Linus Torvalds, a then-student at the University of Helsinki. Torvalds built Linux as a free and open source alternative to Minix, another Unix clone that was predominantly used in academic settings. He originally intended to name it “Freax,” but the administrator of the server Torvalds used to distribute the original code named his directory “Linux” after a combination of Torvalds’ first name and the word Unix, and the name stuck.How can I contribute to Linux?
Most of the Linux kernel is written in the C programming language, with a little bit of assembly and other languages sprinkled in. If you’re interested in writing code for the Linux kernel itself, a good place to get started is in the Kernel Newbies FAQ, which will explain some of the concepts and processes you’ll want to be familiar with.But the Linux community is much more than the kernel, and needs contributions from lots of other people besides programmers. Every distribution contains hundreds or thousands of programs that can be distributed along with it, and each of these programs, as well as the distribution itself, need a variety of people and skill sets to make them successful, including:
- Testers to make sure everything works on different configurations of hardware and software, and to report the bugs when it does not.
- Designers to create user interfaces and graphics distributed with various programs.
- Writers who can create documentation, how-tos, and other important text distributed with software.
- Translators to take programs and documentation from their native languages and make them accessible to people around the world.
- Packagers to take software programs and put all the parts together to make sure they run flawlessly in different distributions.
- Evangelists to spread the word about Linux and open source in general.
- And of course developers to write the software itself.
How can I get started using Linux?
There’s some chance you’re using Linux already and don’t know it, but if you’d like to install Linux on your home computer to try it out, the easiest way is to pick a popular distribution that is designed for your platform (for example, laptop or tablet device) and give it a shot. Although there are numerous distributions available, most of the older, well-known distributions are good choices for beginners because they have large user communities that can help answer questions if you get stuck or can’t figure things out. Popular distributions include Debian, Fedora, Mint, and Ubuntu, but there are many others.Wednesday, January 11, 2017
- User Account: Programs launched from the Bash shell will run as if they were launched by the current Windows user account.
- Permissions: These programs will have the same permissions as the Bash.exe process. So, if you want these commands to have Administrator access, you’ll need to run the Bash shell as Administrator.
- Working Directory: Windows programs share the same “working directory” as the Bash shell. So, if you run a command that lists the contents of the current directory, it will list the contents of the current working directory in the Bash shell. Use the cd command to change working directories.
Monday, January 9, 2017
Powering on the computer
BIOS and the POST
Booting the operating system
Hardware devices communicating with the computer
Computer Overview
15 computer topics
- Transistors - The computer contains millions of transistors, which are used to create machine language using logic gates that turn on and off the circuits.
- Machine language - All computers and electronic devices communicate in binary, which is a series of 0's and 1's or Off and On electrical signals. All software written on your computer is created in a high-level programming language that humans can understand. When complete, the program is compiled into a low-level machine language that computers understand.
- ASCII codes - Each binary 0 or 1 is considered a bit and each number, letter, or other character is made up of eight bits (one byte). A common method for storing and editing text is done with ASCII codes, which is one byte of binary. For example, the lowercase letter "a" has a ASCII code decimal value of 97, which is 01100001 in binary.
- Motherboard - The Motherboard is the largest circuit board in the computer that holds and connects everything together. Without the motherboard, components like your processor and memory could not communicate with each other.
- Computer memory - Not to be confused with disk storage, the computer memory (RAM) is volatile memory and is used to store currently running applications. When the computer is turned off, all data in the memory is lost.
- Computer disk storage - A non-volatile type of memory, disk storage like a hard drive is what stores your information even when the computer is turned off. All of your personal files, documents, songs, photos, etc. are stored in a storage device.
- ROM - Another type of memory, read-only memory (ROM) is a memory chip that has data which can only be read. Most computers today have a programmable read-only memory (PROM), which is still read-only, but can be re-programmed if needed through a firmware update.
- Memory capacity - All memory and storage has a total capacity that is written using abbreviations such as KB, MB, GB, and TB.
- Processor - The Central Processing Unit (CPU) is the component responsible for processing all instructions from software and hardware.
- Software and Hardware - Software is instructions and code installed into the computer, like the Internet browser you're using to view this page. Hardware is a physical device you can touch, like the monitor you're using to display this page.
- Input/Output - A computer works with a human by inputting data using an input device such as a keyboard, having the processor process that data, and then displaying the output on an output device such as a monitor. The printer is also another output device and is what allows you to get a hard copy of documents and pictures stored on the computer.
- Expansion cards - An expansion card is a card that can be added to the computer to give it additional capabilities. A video card, modem, network card, and sound card are all examples of expansion cards. However, many computers may also have on-board devices, such as a sound card and network card that are built onto the motherboard. For a laptop computer, additional cards are added into the PC Card slot.
- Programming - All software running on the computer has been created using a programming language by a computer programmer.
- Operating system - Every computer must have an operating system for software to communicate with the hardware. For example, most IBM compatible computers run the Microsoft Windows operating system and have the option to run alternative operating systems, such as a Linux variant. Apple computers only run macOS.
- Network - Computers communicate with other computers over a network using a network interface card (NIC) or Wi-Fi that connects to a router. There are two primary types of networks: a local area network (LAN) and a wide area network (WAN). The Internet is also considered a network, which uses the TCP/IP protocol.
How does a computer work?
How to use a computer
Computer history
Keep informed
Online free books
Learn more about computers
Pick up a programming language
Learn alternative operating system
Learn more on networking
Related Questions
Saturday, January 7, 2017
Reboot
Background programs
Delete temp files
Free hard drive space
- Determining available hard drive space.
- Regaining computer hard drive space.
Bad, corrupted or fragmented hard drive
- Run ScanDisk, chkdsk, or something equivalent to verify there is nothing physically wrong with the computer's hard drive.
- Run Defrag to help ensure that data is arranged in the best possible order.
- Use other software tools to test the hard drive for any errors by looking at the SMART of the drive.
Scan for malware
Scan for viruses
Hardware conflicts
- Verify that the Device Manager has no conflicts. If any exist, resolve these issues as they could be the cause of your problem.
Update Windows
- Make sure you have all the latest Windows updates installed on the computer.
- If you are on the Internet when your computer is slow, make sure all browser plugins are up-to-date. You can also try disabling browser plug-ins to see if one of them is causing the slowness.
Update your drivers
Reboot computer again
Memory upgrade
Hard drive upgrade
Run Registry cleaner
Computer or processor is overheating
Erase computer and start over
Hardware issues
Old computer
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