Make them all glow, can you?

Instructions:
 Click on orbs arranged in a grid to make them all glow. Clicking on an orb 
changes its state from unlit to lit or lit to unlit along with the 
neighboring orbs. Turn on all the orbs to pass a level with as few moves 
as you can. There are 9 levels, each with more orbs than the previous one.
Two difficulty modes. In the easy mode, all orbs are unlit in the beginning 
and in the hard mode, some orbs are already lit to make things difficult 
for the player.
Author:
MUKTO SOFTWARE LTD.

Python - Coding with fun

How to reverse a string?

s = 'abcdef'
s = s[::-1]
print s 

Explanation: "::" is known as stride notation

s[::2]
s[::-2]

Returns "ace" and "fdb" respectively.

How to read from console in Python?

name = raw_input()

Want to read an integer?

num = raw_input()
num = int(num) # raw_input returns string, so convert it to integer

Swap values in python:

a, b = b, a

My motivation to learn python is: life is short - you need Python

Installing Apache Maven-Java tool

Download maven.

Windows OS:

1. Unzip the distribution archive, i.e. apache-maven-3.0.4-bin.zip to the directory you wish to install Maven 3.0.4. These instructions assume you chose C:\Program Files\Apache Software Foundation. The subdirectory apache-maven-3.0.4 will be created from the archive.
2. Add the M2_HOME environment variable. [almost similar as this]: adding the M2_HOME variable in the system variables with the value                                                                                      C:\Program Files\Apache Software Foundation\apache-maven-3.0.4. Be sure to omit any quotation marks around the path even if it contains spaces.
3. In the same dialog, add the M2 environment variable in the system variables with the value %M2_HOME%\bin.
4. In the same dialog, update/create the Path environment variable in the system variables and prepend the value %M2% to add Maven available in the command line.
5. In the same dialog, make sure that JAVA_HOME exists in your system variables and it is set to the location of your JDK, e.g.C:\Program Files\Java\jdk1.5.0_02 and that %JAVA_HOME%\bin is in your Path environment variable.
6. Open a new command prompt and run mvn --version to verify that it is correctly installed.

Linux based/Ubuntu Operating Systems:

1. Extract the distribution archive, to the directory you wish to install Maven 3.0.4. These instructions assume you chose /home/username/java/tools/maven.
2. Open terminal and type:  gedit ~/.bashrc
3. Set environment variable by adding the following lines at the bottom of .bashrc :
   
   •  export M2_HOME=/home/username/java/tools/maven
   • export M2=$M2_HOME/bin
   • export PATH=$M2:$PATH
   • export JAVA_HOME=/usr/lib/jvm/jdk-default #if JAVA_HOME not exist.
4. Run mvn --version to verify that it is correctly installed.

Send and receive SMS using GSM modem or phone on Ubuntu | TechyTalk.info

Send and receive SMS using GSM modem or phone on Ubuntu | TechyTalk.info.

#go to terminal and give the msg as below
#sudo python sms.py 'CellNumber Msg you want to send'
import gammu
import sys

def main():
    words = sys.argv[1].split(None, 1)
    dest = words[0]
    msg = words[1]
    print msg + "-----" + dest
    #return

    sms = gammu.StateMachine()
    sms.ReadConfig()
    sms.Init()

    message = {
        'Text': msg,
        'SMSC': {'Location': 1},
        'Number': destinationNumber,
    }
    print sms.SendSMS(message)

if  __name__ =='__main__':
    main()

How to create non-editable JTable:

Override the method "isCellEditable" and implement as needed, such as:

//instance table model
DefaultTableModel tableModel = new DefaultTableModel(){
    @Override
    public boolean isCellEditable(int row, int column) {
        return false;
    }
};
//...other codes
table.setModel(tableModel);

System.getProperty(key) key list for Java with value:

java system get property, private link.

System.getProperty(key) key list for JAVA:

java.version	Java Runtime Environment version
java.vendor	Java Runtime Environment vendor
java.vendor.url	Java vendor URL
java.home	Java installation directory
java.vm.specification.version	Java Virtual Machine specification version
java.vm.specification.vendor	Java Virtual Machine specification vendor
java.vm.specification.name	Java Virtual Machine specification name
java.vm.version	Java Virtual Machine implementation version
java.vm.vendor	Java Virtual Machine implementation vendor
java.vm.name	Java Virtual Machine implementation name
java.specification.version	Java Runtime Environment specification version
java.specification.vendor	Java Runtime Environment specification vendor
java.specification.name	Java Runtime Environment specification name
java.class.version	Java class format version number
java.class.path	Java class path
java.library.path	List of paths to search when loading libraries
java.io.tmpdir	Default temp file path
java.compiler	Name of JIT compiler to use
java.ext.dirs	Path of extension directory or directories
os.name	Operating system name
os.arch	Operating system architecture
os.version	Operating system version
file.separator	File separator ("/" on UNIX)
path.separator	Path separator (":" on UNIX)
line.separator	Line separator ("\n" on UNIX)
user.name	User's account name
user.home	User's home directory
user.dir	User's current working directory

Download video from youtube in Ubuntu terminal

First download and install the program youtube-dl from terminal:

sudo apt-get install youtube-dl

After installation, you can download video from YouTube:

youtube-dl -o file_name.flv youtube-video-link

Sudoers - Community Ubuntu Documentation

Shutting Down From The Console Without A Password

Often people want to be able to shut their computers down without requiring a password to do so. This is particularly useful in media PCs where you want to be able to use the shutdown command in the media centre to shutdown the whole computer.

To do this you need to add some cmnd aliases as follows:

Cmnd_Alias SHUTDOWN_CMDS = /sbin/shutdown, /sbin/halt, /sbin/reboot

You also need to add a user specification (at the end of the file after the "%admin ALL = (ALL) ALL" line so it takes effect - see above for details):

ALL=(ALL) NOPASSWD: SHUTDOWN_CMDS

Obviously you need to replace "" with the username of the user who needs to be able to shutdown the pc without a password. You can use a user alias here as normal.

via Sudoers - Community Ubuntu Documentation.

FilePermissions

FilePermissions - Community Ubuntu Documentation.