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About Pravin Hanchinal

Welcome, as you can see, my name is Pravin Hanchinal and I’m an Professional Speaker, Educator, Edupreneur, Entrepreneur,Big Data and Cloud Evangelist. I specialize in educating people in Computer Science. I do web, mobile app design and development in using open source and industry standards . I am also working on cloud technologies, Big Data, cross platform mobile development. I give talks on topics of my interest at my free.

Why we celebrate Naga Panchami?

While most are busy with celebration of Naga Panchami, we were wondering why we celebrate it. Here is what we found for Why we celebrate Naga Panchami.

In the Mahabharata epic, Janamejeya, the son of King Parikshit of Kuru dynasty was performing a snake sacrifice known as Sarpa Satra, to avenge for the death of his father from a snake bite by the snake king called Taksaka. A sacrificial fireplace had been specially erected and the fire sacrifice to kill all snakes in the world was started by a galaxy of learned Brahmin sages. The sacrifice performed in the presence of Janamejaya was so powerful that it was causing all snakes to fall into the Yagna kunda (sacrificial fire pit). When the priests found that only Takshaka who had bitten and killed Parisksihit had escaped to the nether world of Indra seeking his protection, the sages increased the tempo of reciting the mantras (spells) to drag Takshaka and also Indra to the sacrificial fire. Takshaka had coiled himself around Indra’s cot but the force of the sacrificial yagna was so powerful that even Indra along with Takshaka were dragged towards the fire. This scared the gods who then appealed to Manasadevi (folk Goddess of Snakes) to intervene and resolve the crisis. She then requested her son Astika to go to the site of the yagna and appeal to Janamejaya to stop the Sarpa Satra yagna. Astika impressed Janamejaya with his knowledge of all the Sastras (scriptures) who granted him to seek a boon. It was then that Astika requested Janamejeya to stop the Sarpa Satra. Since the king was never known to refuse a boon given to a Brahmin, he relented, […]

By |August 18th, 2015|Spiritual Science|0 Comments

Difference between shell, console, and terminal?

In the Linux world they can all look the same from the point of view of the user at the keyboard. The differences are in how they interact with each other.
Shell:
The shell is the program which actually processes commands and returns output. Most shells also manage foreground and background processes, command history and command line editing. These features (and many more) are standard in bash, the most common shell in modern linux systems.
Terminal
A terminal refers to a wrapper program which runs a shell. Decades ago, this was a physical device consisting of little more than a monitor and keyboard. As unix/linux systems added better multiprocessing and windowing systems, this terminal concept was abstracted into software. Now you have programs such as Gnome Terminal which launches a window in a Gnome windowing environment which will run a shell into which you can enter commands.
Console:
The console is a special sort of terminal. Historically, the console was a single keyboard and monitor plugged into a dedicated serial console port on a computer used for direct communication at a low level with the operating system. Modern linux systems provide virtual consoles. These are accessed through key combinations (e.g. Alt+F1 or Ctrl+Alt+F1; the function key numbers different consoles) which are handled at low levels of the linux operating system — this means that there is no special service which needs to be installed and configured to run. Interacting with the console is also done using a shell program.

Why Learn Linux?

But being in IT it is quite necessary to gain knowledge on Linux either to have fun or on career front. Read further more to know about why learn Linux?
Linux is Everywhere!
Whether you know it or not you are already using Linux every day. Every time you use Google or Facebook or any other major Internet site, you are communicating with servers running Linux. Most DVRs, airplane and automobile entertainment systems and recent TVs run on Linux. Most ubiquitously, if you are using an Android phone, you are using a flavor of Linux.

At its core, Linux is software used to control hardware like desktop and laptop computers, supercomputers, mobile devices, networking equipment, airplanes, and automobiles; the list is endless. Linux is everywhere.
What is it about Linux that makes it so versatile?
Linux is available under the GNU GPL license, which means it can be freely used on almost whatever product or service you’re developing, often free of charge, as long as the license terms are respected. Linux development is community-based; as people improve and create clever ways to make Linux work on an almost infinite variety of devices and platforms, they contribute their changes back so other people can continue to build on or be inspired by them. In short, it is this very community that helps drive the massive growth and versatility of Linux.

Because so many people are using and contributing to Linux, the software is better and more versatile than what any one company or individual could possibly create on his or her own. In fact, in 2008 it was estimated that up to that point, developing Linux had cost roughly $1.4 trillion U.S. dollars! This is obviously far […]

By |July 16th, 2015|OpenSource|0 Comments

How to choose right domain name?

Choosing a domain name is similar to choosing a company name it requires a lot of thought and consideration. Your domain name is your identity on the Web; you want to make sure you choose a name that not only fits your business, but is also easy to find and promote. These steps will help, how to choose right domain name.
1. Make it Easy to Type
Finding a domain name that’s easy to type is critical to online success. If you use slang (u instead of you) or words with multiple spellings (express vs. xpress), it may be harder for customers to find your site.
2. Keep it Short and Simple
If your domain name is long and complex, you risk customers mistyping or misspelling it. Short and simple is the way to go.
3. Use Keywords
Try using keywords that describe your business and the services you offer. For example; if you’re a glass replacement business, you may want to register GlassRepair.com or GlassReplacement.com. Include the keywords that people enter when searching for your products or services. It helps improve your rank on search engines (which increases traffic) and just makes more sense to your customers.
4. Target Your Area
If your business is local, consider including your city or state in your domain name to make it easy for local customers to find and remember. Example: PhoenixGlassRepair.com.
5. Avoid Numbers and Hyphens
Numbers and hyphens are often misunderstood — people who hear your website address don’t know if you’re using a numeral (5) or it’s spelled out (five) or they misplace or forget the dash. If you need these in your domain, register the different variations to be safe.
6. Be Memorable
There are millions of registered domain names, so having […]

By |June 13th, 2015|Digital Literacy, Uncategorized|0 Comments

Infamous bugs in the history of Computer History

Here are few instances where Software bugs can make world upside down!

F-16 autopilot flipped plane upside down whenever it crossed the equator.
Air New Zealand crash in Antartica when computer data error detected but crew was not informed.
Computer bug showed ghost train near Embarcadero station on San Francisco Muni.
Software bug caused F14 to fly off the end of an aircraft carrier into the North Sea.
F18 computer opened missile retention clamp, fired missile and re-closed clamp before missile had had enough time to move away from aircraft.
San Francisco BART doors opened while train was at full speed; control system’s inter-station delay time was too short for TransBay Tunnel.
United Airlines 767 iced up because fuel-saving computer was over-efficient, causing engines to cool down too much on approach to Denver.
Mariner 1 launch failed due to period instead of comma in FORTRAN program DO statement (famously know to – The most expensive hyphen).
Computer error caused US naval vessel to open fire 180 degrees off target, in the direction of Mexican merchant ship.
Gemini V splashed down 100 miles off target when program used 360 degrees for Earth’s rotation in 1 day, i.e. ignoring its movement around the Sun.
Vancouver Stock Exchange Index rose by 50% when 2 years of round-off errors in computer program were corrected.
Viking spacecraft had misaligned antenna due to faulty code patch.
F16 computer deadlocked, confusing left & right while plane was inverted.
180 degree heading error caused Soviet test missile to aim for Hamburg instead of the Arctic.
Autopilot error caused China Airlines 747 to stall near San Francisco.
Robot killed Japanese auto worker attempting to repair another robot.
AT&T software bug knocked out all long-distance phone service to Greece.
Shuttle laser experiment failed because computer data was in […]

By |December 22nd, 2014|Computer Science|0 Comments

What image file type to use?

Here is a infographic to help you decide what image file to use for what purpose. Choosing among JPEG, GIF and PNG is bit complicated. In a nutshell JPEG for colorful photographs, GIF for animation and PNG for logos where transparency is required within image.

What code you should learn?

Here is informative infographic which suggest you what you should learn. There are lot of insights provided yet, here are few things you can conclude with.

If you are beginner: Pick PYTHON, as it is easy to learn.
Powerful Language: C++
Long term focused: JAVA

For Web Apps and pages: HTML, CSS

To make Web Apps and pages interactive: Java Script

To store user information: PHP

To build Mobile Apps: Objective C (iOS), JAVA (Andriod)

By |December 12th, 2014|Computer Science, Web|0 Comments

What will happen when you steal a hackers computer?

This talk, “What will happen when you steal a hackers computer?” on DEFCON, a hackers conference is one of the funniest and geekiest talk we have ever come across. Watch how speaker communicate with his stolen machine and outwit the thief with his smart tricks.

By |December 11th, 2014|Computer Science|0 Comments

Why system ask us to burn the data into CD-DVD instead copy?

Why does the system use the word burn instead of copy? Doesn’t it sound like it is asking to put the data into fire?!

Here is the reality behind the word burn.

The information on a disc is  recorded in the digital form, representing a series of zeros and ones. A disc has a thin reflective metal sheet with a translucent dye layer on the top. The CD writer is equipped with a powerful ‘write laser’ that burns translucent dye to make it opaque. The parts which are opaque block light from the reflecting of the metal sheet, giving them a digital value Zero. The parts which are left translucent get a value of One.

This is why the word burn is used instead of copy/paste.

By |December 4th, 2014|Computer Science|0 Comments

Whose Brain Child are you?

Here is a interesting quiz which finds out which brain child are you? It is based on your answers in decision making. It is very interactive and give details on parts on brain too.

Here are few screenshots how it looks. I got Cleopatra Voltaire for my personality. How about you?

Click Here to take the quiz right now

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By |November 20th, 2014|Life Hacks|0 Comments