How to format pendrive or Memorycard or USB in ubuntu by Terminal

Hi…all today ..i tried to to format by pendrive by our file manager. But sometimes it fails to format.So we have to format it by terminal.

After plugging your device(usb or pendrive or memory card).

Open Terminal(cntrl +Alt + T)

type the command as $ dmesg | Tail

it will display like this

[ 1749.108796] sd 9:0:0:0: [sdb] Write Protect is off
[ 1749.108813] sd 9:0:0:0: [sdb] Mode Sense: 43 00 00 00
[ 1749.109803] sd 9:0:0:0: [sdb] No Caching mode page present
[ 1749.109816] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[ 1749.116895] sd 9:0:0:0: [sdb] No Caching mode page present
[ 1749.116906] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[ 1749.118911]  sdb: sdb1    –> Things to be noted
[ 1749.122785] sd 9:0:0:0: [sdb] No Caching mode page present
[ 1749.122800] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[ 1749.123771] sd 9:0:0:0: [sdb] Attached SCSI removable disk

Then Unmount your device by

$ sudo umount /dev/sdb1

Finally Enter this command to format Your device

$ sudo mkfs.vfat -n ‘Ubuntu’ -I /dev/sdb1

Thats it….Now plug out your device and plug in again to use . Your device is now formatted and ready to use now..

Happy coding!!!!


How to fix subtitles delay or ealier with your movies by python code

Hi..all …today i was watching movie with subtitles . I had delay with my subtitles files ,like  subtitles mismatch with  the every scenes of movie.  .

I sloved this issue by python code .Subtitles are in .srt format. (e.x) Pirates of the Caribbean -The Curse of the Black Pearl(2003).srt

I found that i got delay by 2 minutes in my .srt file

Library that  i used : pysrt

Open your terminal (cntrl+alt+t)

type python —> enter into python interpreter mode

import pysrt

if you got any error like –> no moduled named pysrt.  then you need to install pysrt .To install pysrt – sudo easy_install pysrt

for python3 users its available pysrt3

if don’t get any error then you already have this library.

now , if you want to make a delay in .srt file means do like this


>>> subs.shift(seconds=-2) # Move all subs 2 seconds earlier
>>> subs.shift(minutes=1)  # Move all subs 1 minutes later

finally save this file from your terminal by

>>>'path to ur location/', encoding='utf-8')

My Entire code which sloved my delay in .srt file

#! usr/bin/python
import pysrt
subs=open("/home/bala/Pirates of the Caribbean -The Curse of the Black Pearl(2003).srt")
subs.shift(minutes=-2) # Move all subs 2 minutes earlier'/home/bala/', encoding='utf-8')#saves file with in your home directory

This sloved my problem .
Thats it..   Happy coding !!!!

Android Splash Screen Activity

Hi . all i’m going to share about android splash screen activity .

Now Most of the applications coming with splash screen .Before going into session ,make sure you have made the development environment to develop application in android.

Development tools needed for Android are


2.Java Runtime Environment

3.Android ADT and Android Sdk

4.Android API

You can develop application from “Android Studio” also . Its upto to you people. I’m not going to tell about installations and and setting up environment.You can find lot of good tutorials to do this.

Here in this session i’m telling about developing app in Eclipse

Open up Eclipse and create new Android Application Project.

project name i given here is FreeTamilEbooks

package name for me here is com.ebook.freetamilebooks

If you created project in eclipse means you can see the file structure like this

Screenshot from 2013-10-01 21:02:16

in src folder you can see java files.

in layout folder you can see xml files.


Things to remind here .

UI part of the application was done in xml in layout folder.

The coding Part done in java in src folder.

Confusing ?? let me clear this.

UI in the sense , lets imagine a button in a screen,

now for creating a button in a screen you have to use xml in android (dynamically can create in java)

For Actions like clicking a button etc . have to be coded in java .

now got clear with this. I hope u got some idea about this.

now open up java file in src folder .My java code with

package com.ebook.freetamilebooks;

import android.os.Bundle;
import android.os.Handler;
import android.content.Intent;
import android.view.Menu;
import android.view.Window;

public class SplashScreen extends Activity {

	protected void onCreate(Bundle savedInstanceState) {
		 Handler handler=new Handler();
	        handler.postDelayed(new Runnable()
	            public void run() 
	                Intent intent = new Intent(SplashScreen.this,Home.class);
	        }, 3000);

	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(, menu);
		return true;


java code for second Screen

package com.ebook.freetamilebooks;

import android.os.Bundle;

public class Home extends Activity {
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub


my xml codes are 

<RelativeLayout xmlns:android=""
    tools:context=".SplashScreen" >

my home.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
    android:orientation="vertical" >
        android:text="Welcome to home "/>

Finally one important thing to do with AndroidManifest.xml

this xml file is like guidemap . While running our app this file gets executed first and tell the activites ,and necessary things to the emulator.

Android uses DVM (Dalvik Virtual Machine) . It combines java and xml code into .apk format.
java files gets compiled by JVM(Java Virtual Machine)

By default your very first activity is specified in this file. If you have more than one activity you have specify the activities in this file. Else your application won’t work .


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=""
    android:versionName="1.0" >

        android:targetSdkVersion="18" />

        android:theme="@style/AppTheme" >
            android:label="@string/app_name" >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
       <strong> <activity
            android:label="@string/app_name" >


one last thing to do for splash screen . We need an image to show at very first screen of our app.

so choose your image .It must be in .pngformat.
create folder named drawable under /resdirectory in eclipse.

Here i named the image as splash.png . I used that image as in activity_splash.xml like this

you can give any name to your image and make sure same name in while using in xml file too.

Thats it . Now save your file and press Contrl+F11

After home launched from emultor you can see the page like this

Screenshot from 2013-10-01 23:02:00

Thats it. Thanks for reading. Happy coding!!!

Android User Interface Design Basics

Hi.. to all.. today i’m going to share about android UI(User Interface) design .


your UI plays very import role in android application. User can see your User Interface(UI) and interact with your app.

Android provides some pre-built UI components such as structured Layout objects etc.

What is a Layout ?

Layout defines what is drawn on your screen ..In other words, it defines the visual structure of a user interface.

What are the Layouts in Android?

  • Linear Layout
  • Relative Layout
  • Table Layout
  • Frame Layout
  • Grid View
  • List View
  • Scroll View 

Linear Layout:

Linear Layout allows that all it’s child to a single direction either “Vertical ” or “Horizontal“. we can choose the orientation by android:orientation=”vertical/horizontal”


Relative Layout:

Relative layout displays child views in relative positions. The position can be specified as left or right to siblings or below to particular  siblings or it may center .

Getting confused ???

let me clear with sample design..

take an example of  our gmail login page.


Username is left to field of EditText(we call this as edittext  in android ).

similarly Password field is left to another field and also below to Username field

here Sign in Button is center of the screen .

Now you got the clear idea about to use relative layout in android i think..

List view:

List View is a view group that displays list of scrollable items. Items    are inserted into list view using  Adapter.  The source of an Adapter may be Array or database query that puts query results  into list view.

We will see about list view in my upcoming posts..

Grid View:

Grid View is a View Group in android that displays the items in  two-dimensional, scrollable grid. Items are  inserted into Grid View using ListAdapter. See the image for grid view below.


Scroll View:

 Scroll View allows user to scroll the page or screen in android. One of the most important thing about Scroll View to remember is, Scroll View can have only one child.

we will see about Scroll View in my upcoming posts.

Table Layout:

A layout that arranges its children into rows and columns.  Our calculator is the best example for   Table Layout in android.

Hope you liked it.. Thanks for reading…

Android Basics

Hi.. to all ..I’m going to share my Android experience with you . I’m not an expert in android. I’m just a Android Application Developer .I will try to explain all my  posts as easy  for a beginner to understand .

Before going to into the session . I want you to have  some basic knowledge in java or oops . Because in android we are going to code in java.

What is Android?

Android is a Linux based Operating System primarily designed for mobiles such as Smartphones,tablets etc.

Basic Components of Android:



Activity is the building block of UI(User Interface). Almost all of the activities interact with the user .


Intents are system messages, running around inside of devices and notifying applications such as (e.g) New message arrived ,SD inserted . etc. You can not only respond to intents you can create your own intent to launch other activities . I will explain in my upcoming posts.


Content Provider provides a level of abstraction that makes our application data accessed by multiple applications. In short, it makes our application data available to other applications . You can create your own content Provider. I will explain about this later. Android has some default Content provider class such as

(e.g) Contacts Content provider in Android

import android.provider.ContactsContract.Contacts;

by importing this you can access your contacts (Note: read ,write permissions should be given in order to use this in your application)


Activity,intents,content provider are short-lived process they can be killed at any time. But services are long lived process , running in background .

(e.g) You are playing songs in music player in your mobile . Are you still in music player to listen songs? after playing any song we came out to some other screen from player. but player continues to play songs even though we are not in that screen. This is called service in Android.

Thanks for reading ..

How to install/update firefox in ubuntu

Hi…to all today i updated my firefox.  Its so easy to update in ubuntu..

Here the steps are.

Open terminal and type

sudo add-apt-repository ppa:ubuntu-mozilla-security/ppa

 sudo apt-get update

sudo apt-get install firefox

Thats it….. you successfully installed/updated firefox in your system… To check

$ firefox -v

Screenshot from 2013-01-23 09:16:23

this will show the version of the firefox you installed/updated..


Thanks …:)





Nice open source Applications created in Ruby on Rails

Hi….today i just seen the applications which are all created in Ruby on Rails.

Here are the few applications created by ruby rails

1) Notes

Notes is an open source (Reciprocal Public License) Ruby on Rails application designed to be a simple and fast to-do and notes manager.


A to-do-list manager with a clean interface. Tracks lets you to categorize, prioritize, schedule & star items for a better usability .

Interface is Ajaxed & many tasks are done by drag’n drops. The application has multi-user support & comes with a built-in web-server for user who want to install it to their computers.

3) Mephisto

A widely used blogging engine that has ready-to-use plug-ins..

It uses Liquid templates for creating & editing themes. Mephisto also has a built-in caching system for faster loading.

4) Gallery

A simple but functional photo gallery built with Ruby on Rails.

It uses the lightweight mini_magick to resize photos, reducing the memory requirements of the full RMagick suite.

Photos can be sorted by drag’n drops, captions can be edited easily & the look/feel can be customized via CSS.

5) Spree

Spree is a highly extensible & customizable e-commerce application. Developers can easily override existing views, provide new ones or provide additional models, migrations and controllers

6) Ecompages

EcomPages is an e-commerce application which has most of the basic features of an e-store.

It has a good looking admin interface that makes managing products & orders easier.

The application is still being developed & is not feature-rich but can be a good base to start with & improve further.

7)  EchoWaves

This is a group chat social network application. You can start conversations and connect wih other users while discussing it.

It is possible to make a conversation read-only for presenting a content too.

8) Communityengine

A plugin for Ruby on Rails applications for having the features of a social netwoking website instantly.

Some great features include:

  • Authentication (sign up, log in), user search & user profiles
  • Blogs with tagging, categories and rich text editing
  • Photo uploading and tagging
  • Commenting, forums, friendship, activity feeds & more

9) Rubyurl

RubyURL is an online tool for converting long website addresses into short ones.

Besides the standard form input, it is possible to create short URLs via the REST API which supports both JSON & XML requests.

10) Mailr

Mailr is an open source webmail application that can be used with any IMAP server.

E-mails can be created both in HTML & plain text. E-mail addresses in the contact list are Ajax-auto-completed just like Gmail & more.

11)  Warehouse

This is a beautiful web-based subversion browser built with Ruby on Rails.

Multiple repositories can be managed from the same interface. Also, it is possible to add any number of users with different permissions.

12) typo

A Ruby on Rails blogging application that is developed continiously.

It comes with theming & plugins support for easier customization. Every part is planned for a better SEO, like friendly-URLs, ability to add keywords/description to every category/page & more.

Thanks for reading. Enjoy the framework with Rails …:)

Beginning with pygame

Hi…to all …today i learnt how to begin with pygame in python

now lets consider getting intensity range of RED,GREEN ,BLUE  inputs from user  and display the resultant colour in window.


#! usr/bin/python
import pygame
from pygame.locals import *
from sys import exit
r=min(255, input("Enter the red colour intensity  :"))
g=min(255, input("enter the green colour intensity : "))
b=min(255, input("enter the blue colour intensity  :"))
pygame.display.set_caption("colour testing ")
while True:
 for i in pygame.event.get():
  if i.type==QUIT:
 screen.fill((r, g, b))

Run the file by python

Window will appear with the resultant color …

Thats it…enjoy coding with pygame….:) Thanks …..:)

How to get IP address in Python all …today i learnt how to get IP address in python..

To get the Hostname

import socket
print socket.gethostname()

To get the IP Address

import socket
print socket.gethostbyname(socket.gethostname())

we can also check with dummy socket and see the host name

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(('', 0))

Thats it…:)