2010 in review
Posted by: karthikselvakumar on: January 2, 2011
The stats helper monkeys at WordPress.com mulled over how this blog did in 2010, and here’s a high level summary of its overall blog health:
The Blog-Health-o-Meter™ reads This blog is on fire!.
Crunchy numbers
A Boeing 747-400 passenger jet can hold 416 passengers. This blog was viewed about 7,800 times in 2010. That’s about 19 full 747s.
In 2010, there were 19 new posts, growing the total archive of this blog to 79 posts. There were 12 pictures uploaded, taking up a total of 2mb. That’s about a picture per month.
The busiest day of the year was March 22nd with 86 views. The most popular post that day was twitmdu2010 meet – A good init on twitter awareness .
Where did they come from?
The top referring sites in 2010 were karthik.tk, karthikselvakumar.com, google.co.in, digg.com, and mail.yahoo.com.
Some visitors came searching, mostly for easycam ubuntu 9.10, pokemon ball, easycam2 ubuntu 9.10, ubuntu 10.04, and ubuntu 9.10 easycam.
Attractions in 2010
These are the posts and pages that got the most views in 2010.
twitmdu2010 meet – A good init on twitter awareness March 2010
9 comments
Ubuntu 9.10 release November 2009
15 comments
Installing Network Simulator 2 in Ubuntu February 2010
19 comments and 1 Like on WordPress.com,
Make your own OS November 2009
5 comments
Facebook mouseclicks hack ! January 2010
5 comments
Happy bday Don And Chezhian
Posted by: karthikselvakumar on: August 9, 2010
நண்பர்கள் கூட்டத்தில் மரியாதையை கொண்டவனாய்
உன் குடும்பம் பாராட்ட பொறுப்பில் சிறந்தவனாய்
நண்பர்கள் பஞ்சமில்லா அனைவரிடமும் நல்லவனாய்
கட்டளைகளிலும் கை அசைவிலும் வல்லவனாய்
கல்லூரி வரலாற்றில் யாரும் காணாத
தொலை தேடல் கொண்ட GSஆய் நீ இருந்தாய்
உனக்கென்ன இருக்கும் உறவுகளை உயிராய் கருதினாய்
ஆனால் அவளுக்கென ஏங்கி ஏன் இன்றும் நீ வருந்தினாய் !
உன் சிந்தனைகள் அனைத்தும் ஐன்ஸ்டீனை மறு வடிவமாய் காட்டி
உன் சிறு கருத்துகளால் பலரின் வாழ்க்கையே மாற்றி அமைத்தாய்
நீங்கள் இருவரும் அவதரித்த இந்த நாளிலோ இரு சூரியன்
கொண்ட உலகாய் மலர்ந்தது எங்கள் கல்லூரி வாழ்க்கை !
என் நண்பர்களுக்கு இனிய பிறந்த நாள் வாழ்த்துகள்
மரியாதைக்குரிய Respectable Don and GS Chezhian 
நண்பனின் காய்ச்சலிலே …
Posted by: karthikselvakumar on: July 11, 2010
உடல்நலமற்ற தோழன்
உச்சக்களிப்பில் நான்
ஓய்வின்றி நடமாடிய நீ
இன்று நோய்வுற்று மடி சாய்ந்ததால் !
தாலாட்ட இங்கு தாய் இல்லை – இருந்தும்
கவலை உன் கண்ணில் துளி இல்லை
இன்னும் உயிரோடு நான் இருப்பதாலோ !
உயிருள்ளவரை என்னை நினைப்பாயோ !
குணமானபின் நொடியில் மறப்பாயோ !
எதிர்பார்ப்புகள் இன்றி சேவை செய்கிறேன்
என்றென்றும் காத்து கிடக்கிறேன்
மறுமுறை மடிசாயும் தருணத்தை ஏங்கி !
- கார்த்திக் செல்வகுமார்
Session On Java Basics
Posted by: karthikselvakumar on: July 1, 2010
- In: Current affairs | Linux
- 1 Comment
i) Is java purely object oriented language ?
JAVA is not because it supports Primitive datatype such as int, byte, long… etc, to be used, which are not objects.
ii) Write once run anywhere concept ?
Java source code is compiled into class file . This file is executed on any platform which has JVM
iii) public static void main(String args[])
java environment needs acces to execute it –> public
without creating instance need to run main method –> static
main method doesnt return anything — > void
all arguments passed are of string type and placed in a string array –> args[]
iv) diff between == and .equals()
== compare reference
.equals compares the content
v) Access specifier a quick play
public , private protected , default
vi) final , finally and finalize
final – to declare constants and avoid inheriting a class
finally – in exception handling to run a piece of code even exception occurs or not
finalize – whenever garbage collection is about to occur finalize method will be called
vii) java API swing , applets , servlets
viii) no global variable in java ?
referential transparency
namespace collision
ix) Numeric promotion
after any arithmetic operation (byte,char,short)–>int–> long–>double
x) first argument of args[] in C and java
in C first argument will be the name of the program but in java it is the first argument passed
xi) library methods stringtokenizer
StringTokenizer st=new StringTokenizer(“karthik:be:cse”,”:”,false);
while(st.hasMoreElements(){
print(st.nextToken()); {
points about java :
* No pointers - Unauthorized access prevention
* No operator overloading - ambiguity is possible
* No destructor – instead finally is present
* Multithreading made thro language – concurency
* new to allocate memory to object … memory release done by garbage collector
How To Create your own Domain with zero cost !
Posted by: karthikselvakumar on: June 24, 2010
From the day I started browsing I used to think of whats this .com and why can’t i get my own . I browsed among various sites and finally found its all money stealers and they are not running charity anyway 
.
As a frequent surfer I came across a site which proviedes domain for free .For the first site it also seemed weird for me but still I proceeded with registration process .Then it needs a paypal account and I created one with my dad’s ATM card ( our only source of money ) .
Then I got my link working after 3 hours without any amount deduction . Now when i got my link working I will disable my card in Paypal 
. I can enjoy .com domain for 1 year and ofcourse for the next year I would be working in a reputed IT company ( even possibilities are less ) and 9 dollar for renewing my domain would be not at all a great thing . The link to the website is here. And expecting every one to get their own .com domain .
தவறி தவிக்கிறேன் !
Posted by: karthikselvakumar on: June 23, 2010
மொழிகளின்றி பேசிகொல்கிறோம்
மூன்று வருடங்களாய்
வழிகள் அத்தனையும்
சலிக்காமல் வந்தேன்
தவறியாவது ஒரு முறை
பார்ப்பாயா என்று
விசித்திரமாய் சந்தித்தோம்
அன்று இடித்தாய்
அணுவும் வலி இல்லை
உணரவும் மனமில்லை
எதுவும் செய்யாமல்
இன்று தெரிகிறது
என்னில் இரண்டும்
உன்னை கண்ணில் கண்டது
ஒரு சில முறை தான்
ஆனால் கனவில் தெரிகிறாய்
பல கோடி பிம்பங்களாய்
நீ பேசும் மொழி வேறாயினும்
நாம் படிக்கும் கல்வி ஒன்றானதே
கைக்கு கிட்டாதே பொருளுக்கே
மதிப்பும் அழகும் அதிகம்
நிலா நச்சத்திரம் மற்றும் நீ
ஆதலால் நீ என்றும் கிடைக்காமல்
இருக்க வேண்டி கொள்கிறேன்
தொலைவில் இருந்தே ரசித்து செல்கிறேன்
-கார்த்திக் செல்வகுமார்
GIT – a widely used version control system
Posted by: karthikselvakumar on: May 20, 2010
- In: Linux | Projects
- Leave a Comment
git is a widely used version control system with its flexibility and rich command sets .
Here covers three most basic and important functionalities in GIT .
i) Creating a new repository and committing
ii) working with branches
iii) Cloning and distributed working
Creating a new repository and committing
This is a basic operation in any version control system. Assume a scenario where you are creating a maths software using C .
now each project should have a name ( I will be speaking package , software, project and repo interchangeably )
let it be myCproject . now to create a new repo the steps are :
step 1)
create a new directory of that project name
>> mkdir myCproject
step 2)
get into the project and intialis it for git database
>>cd myCproject
>>git init-db
now your project is initialized and ready to accept files .
step 3)
start coding some files and place it myCproject directory . eg ) add.c,mul.c,sub.c,div.c
now this files wont get added to git unless you add into it
>> git add .
>>git commit -a -m ” Your first commit “
step 4)
now your first version of the software should be commited and you can check it by
>> git status
or
>> git whatchanged
step 5)
whenever you perform more than one commit then use
>> git diff
to get the changes from first and second commits .
Sample window :
Working with branches :
now placing all files under single category may be tiresome . So we can group similiar files under a branch .
branch is something like a sub-repo
step 1)
first create a new branch under which you are going to work
let us say math software needs a gui
>> git branch gui
this will create a branch named gui .. to see the list of branches in project you can use
>> git branch
step 2)
by default git will be in branch named master .
to switch over to gui branch use
>> git checkout gui
now your workings will be placed under gui branch after changed dont forgot to commit
>> git commit -a -m ” commit from gui branch “
step 3)
now to switch back to master branch use
>> git checkout master
step 4)
to merge all the changes done by the branch gui to master use
>> git merge gui
and after merging if the branch is no more needed then delete it
>> git branch -d gui
to get a graphical view of branches and files use gitk
Cloning and distributed working :
step 1)
whenever more than one user works with a project then sharing should take place . say two user alice and bob .
bob wants the myCproject from alice . then bob should issue
>>git clone /home/alice/myCproject
now bob will get a copy of alice in his current directory
step 2)
similiarly commit and add are done as
>> git add sub1.c
>> git commit -a -m ” commit from BOB “
step 3)
to get the changes made by bob alice will pull bob and get the changes by
>> git pull /home/bob/myCprojects
Commands overview :
git init-db = initialsises the repository
git add file1 file2 file3 = adds the files to git repository
git commit -a = commits with the next version
git status = current status of files and branch name
git whatchanged = history of all versions
git diff = difference between previous and next version
git branch branch-name = creates a new branch
git branch = lists the all available branches
git checkout branch-name = switches to particular branch
git merge branch-name = merges with other branch
git branch -d branch-name = deletes unwanted branch
git clone repo-url = clones a existing project from other url
git pull repo-url = gets the changes from other repo
jGateway – My simple remote shell using twitter API
Posted by: karthikselvakumar on: May 16, 2010
- In: Linux
- 2 Comments
Requirments :
i) Any operating system ( Linux is preferable )
ii) Java Runtime Environment
ii) Two twitter accounts
Setting up:
Step 1:
Create two twitter accounts one for SERVER and one which acts as CLIENT here :
jGateway account acts as server ( runs on the host machine ) and
karthikselva account acts as client ( RemoteAdmin for the system )
Step 2:
Download my jGateway file from here
always copy execid file along with jGateway.jar
Step 3 :
open a terminal and run the file as java -jar jGateway.jar
if you also need to run admin commands run sudo java -jar jGateway
enter the server username and password of twitter account
this will listen to incoming commands
Step 4:
now to send a shell command to server from any machine just login into your twitter account
and send a direct message to the server account from your account
note : remember both of the accounts are following each other
Step 5:
After the command has been read by the server it will execute the command in same java window .
if the command is valid and has executed succesffully then the server will tweet as <COMMAND_NAME> <SUCCESS>
else the command have failed it will display as <COMMAND_NAME> <FAILED>
Disclaimer :
I have tested my code in Ubuntu 10.04 and its working . If you get any twitterException while running then either your account must be blocked by twitter.com or Check your internet connection before running.
twitmdu2010 meet – A good init on twitter awareness
Posted by: karthikselvakumar on: March 21, 2010
Plot to escape :
I used to worry at every Sundays why I have to waste my precious hours in boredom CAT class in TIME and always used to seek a chance to escape from it . By this time I got a tweet from twitmdu2010 .Its really amazing to hear a IT techtalk being organized even in madurai that too free of cost ( rather not like other money gaining useless workshops or conferences ) .Even I didn’t had a chance to register online I went directly there asking for spot registration.
Welcome to twitmdu2010:
Fortunately their welcome was pleasing and well-organized which I didn’t even expect . Then after a short intro to twitter and how it works they started the session .
Why and how to use twitter :
At the start they frankly mentioned twitter is used by 90 % people for their boredom and to kill time on something. Well then bloggers too used spam their followers with unwanted posts an blah blah ..But the main aim of every twitter user is to gain as many followers as possible . They may be ranging from personal thoughts about a user or a brand based canvasing or any tips and new things about technology.Anything it may be the main mantra to get as many followers is Quality Content in your each and every tweets.
The two keys @ and # are explained where @ is to gain attention of particular user and # tag to make other people make their search way easily to you.Then inorder to contact celebrities you like and ask them or to know what they are doing at present is easily possible through twitter since it has ‘on the go’ support from iPhone or PC even through sms channels around the world .
Do’s about tweets:
Even they clearly mentioned 140 characters is more than enough for displaying your view try to make it within 100 characters . Because retweets may add you name with @ tag . Next thing is choose you name as small as possible . Lecture by Mr. Kalyana sundaram he said why he choose his user name as “$5″ was really good and others too try to have shorter one like that .
Don’ts about twitter:
If you tweet about several things and diverge the followers from what they want then sure you gonna loose them .So streamline your passion towards a single line or at least HashTag your tweet with appropriate words.Bad thing you may have to be mentioned about twitter is following huge number of peoples with a intention that you may get huge knowledge from all parts of the world by doing so. Best case is to have 35 to 50 followers whom you think worthy and you actually know about him.Tweets are not intended for grocery or wholesalers business ( you can try google business as choice for that ) . IT and IT related stuffs gain more trends and importance in twitter.
Tweets as News Agent:
Amazing facts are even NASA tweets the current status of space and many geo-testing plants tweet the earthquake prone area to save people . Many news like tiger woods have been first put on twitter other on any outstanding news channels like CNN or BBC .
Twitter API development :
Going on towards twitter development any one can start developing twitter application using twitter API for any language. I tried it with java and python and found it working .Choice of which API to choose depends on the programmers perspective and its speed of refreshing .I heard something like more than 250 times ping from API per hour will black list particular user and don’t show further tweets. Its a sad news for me 
. But developers can claim a 20,000 ping per hour by just priory asking permission to twitter developers .
Added services on twitter :
For URL shortening and spamming others ( sometimes useful ) use bit.ly.
similarly you can share anything as in other social network like .
* picture upload by twit.pic
* feed updater by twit.feed
* upload a video by twit.vid
and so on additional services are emerging for twitter .
Sad Incident about # tag :
Then heard a short session about CCD sucks with tag #CCDsucks . Really humorous .To be in precise whenever yu get a negative remark about you in twitter with a # tag say for e.g) #karthikselvaSucks
just dont reply to it by using same tag but reply to such negative tweets by adding #karthikselvaResponse tags and mention you reply clearly to particular user who gave you such remark. Never use the same hash tag to reply and loose your reputation yourself.
Im sorry I missed the afternoon session and I found really worthy to spent my time there @twitmdu2010
Thank you for organizing such a great event twitmdu2010 and expecting more camps like this
But I still have a doubt how and why twitmdu has to organize this informative camp for free ??
Setting up a Virtual Network
Posted by: karthikselvakumar on: March 20, 2010
* Make sure all your network harware works properly (e.g. Ethernet Cards, Network cables etc.)
* Click the NetworkManager Applet in your top panel of GNOME environment.
* Select VPN Connections | Configure VPN
* Choose Wired tab
* Click Add button
* Provide your new connection a name
* Trace the MAC address of your Ethernet Card from the existing connection (e.g. Auto eth0)
* Choose IPv4 Settings tab
* Set the Method as “Manual”
* Under Addresses section, Click add button.
* A new tuple (or record or row) appears.
* Fill the column with appropriate data. (e.g. 192.0.0.1 | 255.255.255.0 | 0.0.0.0)
* The subnet mask address must be given as per your IP address
* Click Apply
* Now back to the Network Connection window
* A new network connection will be displayed
* Close it
* Click NetworkManager Applet in the top panel of the GNOME
* Select your network setup
* Wait for a while
* A new network has been set up
Nota Bene:
Do the same with different IP address for different computers.
Ensure all the IP address fall in the same network.
e.g.
—-
192.0.0.1 and 192.0.0.2 falls in same network,
but 192.0.0.1 and 192.0.1.1 is not the same.
Now transferring files between two systems and remote shell login
* Ensure your computer has OpenSSH installed in it.
* Else, please spend some time installing it.
* It can be installed by “sudo apt-get install openssh*”
* After installing SSH, type the command to restart it
* sudo /etc/init.d/ssh restart ( in all computers )
* Now check the ssh by the command “ssh localhost”
* If it works properly, now are ready to transfer and share fun
Transferring files:
* Have the file to be transferred in a place (let we take sample.txt)
* We want to transfer the sample.txt to strawberry user at 192.0.0.2
* The command is: scp sample.txt strawberry@192.0.0.2:. ( . represents home folder)
* Cool, work is done
Courtesy : P U Karthik
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projects by karthikselvakumar is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 India License.
Based on a work at karthik.tk.
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