Linux

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Find your computer's IP Address

Enter the following command in Linux terminal to find your computer's IP Address.

/sbin/ifconfig -a

KNotes

Organize your notes using KNotes

Knotes is an useful small application for managing your notes. It comes as a part of KDE PIM Package.


KNotes_Note

This is how Notes appear on the Desktop. It has a decent interface. Notes are saved by the date and time they were created, Of Course it can be changed. The Pin on the top left gives Notes a nice visual appeal.


KNotes_Display_Settings

By default the background color of notes is yellow and text color is black. It can be changed in the settings. Settings section also has the option to change the default Width and Height of the notes. Though notes can be resized manually using mouse.


KNotes_Mail_Settings

One very nice feature of KNotes is sending the Notes to anyone through mail. Default mail client for sending Notes is kmail but it can be changed to any other mail client like Evolution in Action settings.


KNotes_Network_Settings

Notes can be sent or received over a network. Changes can be done in the Network settings.

Good Points

  • Alarm: You can set alarms
  • Mail: Mail your notes
  • Send Notes over netork
  • Good GUI: background color of the notes can be changed

Bad Points

  • Not Optimized for both Mouse and Keyboard: There should have been more keyboard shortcuts for managing the notes

Conclusion
You cannot take your computer with you but with the help of KNotes you can organize of Desktop more effectively and it is a really nice application to remind you of important tasks.

Linux in Offices

Do you want to setup a Mail Server or Do you want more security for you network. Linux is the Operating System for you.

Mail Server

Security

Backup

Linux in Schools

Linux Operating System can be used in Schools and other educational institutes for Learning and Teaching.

It offers many advantages over Windows Operating System

1. Low Cost

Linux Operating System can be downloaded free from the internet. Since Linux is based on Open Source technology hence the software cost associated with it is ZERO. No License is required to install Linux and it can be distributed to other free of cost. Linux and its applications will always be free of charge.

Windows in the other hand is costly and future Upgrades and Maintenance is very costly. License is required to use Windows and it applications like Microsoft Office.

2. Linux can run on Old Computers - Once Again cost saving

Biggest advantage of Linux is that it can be installed on old computer whereas new versions of windows like xp and vista can only be installed on new Hardware.

3. Wide range of applications

Linux Operating system like Edubuntu offers wide range of application for educational purpose and other day to day activities.

Office Suite

OpenOffice.org is a complete office suite similar to the Microsoft Office suite. It features a word processor, as well as spreadsheet, presentation, drawing, database, and mathematical formula applications. OpenOffice.org can open and convert most Microsoft Office documents and has support for many different languages.

Web Browser

Firefox is the incredible successor to the hugely popular Mozilla browser. Amongst its many features are tabbed browsing, which makes viewing multiple sites a breeze, pop-up blocking, live bookmarks and great accessibility support. Combine these with its fantastic customisation engine and you have the most powerful web browsing at your fingertips.

Email, IM and VoIP

Moving beyond the simple web browser, Edubuntu also comes with an email client and personal information manager, Evolution. Video conferencing with Ekiga as well as instant messaging and chat with Gaim provide communications tools that teachers and students need in an Internet age.

Graphics

In the graphics deparment, diagrams and flowcharts are a breeze with Dia. Xsane provides an easy to use scanner interface. 3D modeling and animation are Blender's specialty. Image editing similar to Adobe Photoshop is done using the GIMP. Scribus provides layout and publishing capabilites similar to Adobe Illustrator.

Sound and Video

For all your video and audio play and editing needs, Edubuntu provides several programs including Rhythmbox for music playing and Serpentine for burning audio CDs. Sound Juicer rips audio CD tracks to your computer. Totem is an excelent video and movie player and you can use Kino to edit video clips. Sound Recorder can be used to record audio clips to your computer.

Science

  • Explore the stars - KStars is a Desktop Planetarium that provides an accurate graphical simulation of the night sky. The program includes details for 130000 stars, 13000 deep-sky objects and all of the planets. KStars has an easy to use interface, so it can be used by everyone, from amateurs through to astronomy experts. You will also find a great deal of general information regarding telescopes and other astronomy related matter.
  • Research the periodic table - Kalzium is a package for discovering and researching information about the periodic table and the elements. It includes pictures for most of the 111 elements present, along with more detailed information including atomic models, spectrum analysis, chemical data and energies.
  • Test your chemistry skills - Atomix is a puzzle game, the purpose of which is to make up the molecule displayed from the pieces scattered throughout the level. You can only move them up, down, left and right and they don't stop moving until they hit something.

Mathematics

  • Program in Logo - KTurtle is a Logo programming language interpreter. The Logo programming language is very easy to learn and thus it can be used by young children. A unique quality of Logo is that the commands or instructions can be translated, so the 'programmer' can program in his or her native language. This makes Logo ideal for teaching kids the basics of programming, mathematics and geometry. One of the reasons many children warm to Logo is due to fact that the programmable icon is a small turtle, which can be moved around the screen with simple commands and can be programmed to draw objects.
  • Create geometric constructions - Kig is a allows teachers and students to create high precision geometrical constructions. These can be built on and used to explain concepts like perpendicular bisectors, tangents and arcs.
  • Plot mathematical equations - KmPlot is a mathematical function graphing and plotting package. KmPlot has a built in a powerful expression parser and you can plot different functions simultaneously and combine their terms to build more complex mathematical functions. It supports functions with parameters and functions in polar coordinates. Plots may also be printed with high precision.
  • Calculate percentages - KPercentage is a mathematical application that helps pupils improve their skills in calculating percentages. Percentages are split into three types and KPercentage tests pupils on these in three training modes. In addition to this, there is a random mode which will pick questions from each of the three percentage question variations.
  • Practice Fractions - KBruch is a small program to help pupils practice calculations involving fractions. There are four different types of fraction exercise:
    • Exercise Fraction Task; where pupils have to solve a given fraction task
    • Exercise Comparison; where pupils have to compare 2 given fractions sizes
    • Exercise Conversion; where pupils have to convert an already given number into a fraction
    • Exercise Factorization; where pupils have to factorize a given number into its prime factor
  • Play at Math - TuxMath is an educational arcade game starring Tux, the Linux mascot! Based on the classic arcade game "Missile Command," Tux must defend his cities by solving arithmetic problems.

Drawing

  • Tux Paint - Tux Paint is a free drawing program designed for young children. The program provides an easy to use interface with fun sound effects and an encouraging cartoon mascot that gives help to children while they are painting.
  • Generate Fractals - Xaos is a fractal generator with a whole host of extra features for teaching pupils about fractal patterns.

Language

  • Practice Spanish verbs - With KVerbos you can practice Spanish verb conjugation. The program comes with a large set of over 9,000 Spanish verbs that you can choose from to begin your verb training. The package also keeps track of previous scores so that pupils can identify where their strengths and weaknesses are. Some exercises also have a time limit to raise the level of difficulty for more advanced users.
  • Play Hangman - KHangman is the classic hangman game with pupils try to guess a word, letter by letter. At each miss, the picture of a hangman is added to. After 10 incorrect tries the game is over.

Basic Skills

  • Generate and give tests - KEduca is an educational testing package, allowing teachers to create tests for pupils to take. KEduca includes a module for constructing and saving new tests, as well as a separate module for loading and running the exams. Questions can be enhanced with images, multiple choice answers with varying grades, and time limits.
  • Learn touch typing - KTouch helps pupils to learn to type quickly and correctly. With many different modes and detailed reporting, KTouch truly makes learning touching typing easily.
  • Gcompris - Gcompris is a suite of over 80 educational games and activities for kids age 4 to 10 to learn with. These include:
    • computer discovery: keyboard, mouse
    • algebra: table memory, enumeration, double entry table, mirror image
    • science: the canal lock, the water cycle, the submarine, electric simulation
    • geography: place the country on the map
    • games: chess, memory, connect 4, oware, sudoku
    • reading: reading practice
    • other: learn to tell time, puzzle of famous paintings, vector drawing

Change display resolution in Linux

Your Graphics Card support higher resolutions but your Linux distribution display is set to 800x600. You can change the resolution easily by following the below steps.


1. First check all the possible resolutions supported by your graphics card using the following command.

"xrandr"

It will display all possible resolutions like this.

Screen 0: minimum 400 x 300, current 1152 x 864, maximum 1152 x 864
default connected 1152x864+0+0 0mm x 0mm
1152x864 75.0* 70.0 60.0
1152x768 55.0
1024x768 85.0 75.0 70.0 60.0 87.0
832x624 75.0
800x600 85.0 75.0 72.0 60.0 56.0
640x480 85.0 75.0 73.0 67.0 60.0
720x400 70.0 85.0
640x400 85.0
640x360 85.0 75.0 70.0 60.0
640x350 85.0
512x384 87.0
416x312 75.0
400x300 85.0 75.0 72.0 60.0

The current selected resolution will have a * (asterix) next to it.


2. Change resolution.

Suppose your graphics card support 1024x768 resolution then you can change it using the following command.

"xrandr -s 1024x768"

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