Posts Tagged: Linux

A shell script for Renaming large number of files in Linux

Hi, today I’m going to Blog about a very simple shell script, that may help you guys a lot.NO big deal, its very simple one. It was very helpful to me, once I had to rename a large number of images of Kim Kardashian.  So then I realise it will very easy doing it with a Shell script rather than manually rename it.#!/bin/bash
# Author: Gihan De Silva @
# rename script
for i in `ls *.jpg`
x=`expr $x + 1`
mv $i Kim_Kardashian$x.jpg

echo “rename done!”

Code Explanation!


This is how always a shell script starts.


This line clears all the things already in the terminal window.


This line define and declare a variable.

for i in `ls *.jpg`

This line starts a loop and, it will list down all the JPEG(jpg) type images.

x=`expr $x + 1`

This line increases the value of x by 1.

mv $i Kim_Kardashian$x.jpg

This line renames all the files according to a sequence like, Kim_Kardashian1.jpg , Kim_Kardashian2.jpg, Kim_Kardashian3.jpg  ……

And you can just make Kim_Kardashian$x.jpg like My_file_name_$x.jpg ,so that’s it.

And to run this shell script, put shell script into your file folder (directory) .

Then open Terminal window (Ctrl+T).

Go to your file folder through the terminal.

Then type chmod 755 to get the permission.

Then run it by typing ./

Now you will see files have renamed :D.

You can DOWNLOAD the shell script from here!

Thank you

Gihan De Silva

How to install and configure Android SDK with Eclipse on Ubuntu 11.04

Hi, today I’m going to tell you how to install and configure Android Software Development Kit with Eclipse on ubuntu 11.04 environment. These days Android application developing has became major trend. So as application developers we should also consider about new trends. To set up a computer in order to develop Android applications we need 4 things.

  1. Java Development tool Kit (JDK)
  2. Eclipse IDE
  3. Android SDK for Linux(i386)
  4. Android plug-in for Eclipse

Ok now I assume you have downloaded and installed JDK and Eclipse or already have both of them.

Now extract the Android SDK into a safe location, (keep this on your mind, that downloaded Android SDK is not a full development environment. It only contains the core libraries. When configuring it with Eclipse you need to download at least one of the android developing environments.)

Then start Eclipse ,to install the android plug-in for eclipse.

Then go to Help –> Install New Software

Click Available Software Sites as shown on above image.

At the preferences window, click add

At the NAME field give Galileo or some-name , and   at the LOCATION field give this URL if you use Eclipse Galileo version :

If you are using Eclipse Helios, use this URL instead of that.

then click OK.

Now move back to the install window

then click Add, in the top-right corner.

Enter ADT_Plugin for the Name and the following URL for the Location field:

OR you can point downloaded file as Archive (you shouldn’t extract it)

then, Click OK.

In the Available Software window , check the check-box

In the Available Software dialog, select the checkbox next to Developer Tools and click Next.

In the next window, there will be some tools to be downloaded. Click Next.

Read and accept the license agreements, then click Finish.

Sometimes you may get a security warning like this, click OK

When the installation completes, restart Eclipse.

Now you should add android platforms..

Start Eclipse Window –> Android SDK and AVD Manager.

This process may take some time…!

Then under the Available packages select at least one or all, then click Install Selected.

Then go to windows –> preferences, under it click Android tab and click OK.

Now you are ready to go with Android+Eclipse.


Gihan Malan De Silva.

Some Useful important things about XAMMP for Linux

Hi, today I’ll mention some important things on XAMPP.

How to set XAMPP to start up programs

(XAMPP will automatically starts with the computer starts)

First login as root user

Now press (Clrt+Alt+T) to open Terminal window
then type sudo -s -H
then enter this command,
command: sudo ln -s /opt/lampp/lampp /etc/init.d/lampp

                    sudo update-rc.d -f lampp defaults

Uninstall XAMPP

First login as root user. then use this on terminal,

command: rm -rf /opt/lampp



command: /opt/lampp/lampp start


command: /opt/lampp/lampp stop

Stop and start XAMPP

command: /opt/lampp/lampp restart

Start only the Apache

command: /opt/lampp/lampp startapache

Start the Apache SSL support

command: /opt/lampp/lampp startssl

Start only the MySQL database

command: /opt/lampp/lampp startmysql

Start the ProFTPD server

command: /opt/lampp/lampp startftp

Stop the Apache

command: /opt/lampp/lampp stopapache

Stop the Apache SSL support

command: /opt/lampp/lampp stopssl

Stop the MySQL database

command: /opt/lampp/lampp stopmysql

Stop the ProFTPD server

command: /opt/lampp/lampp stopftp

Start a small security check programm

command: /opt/lampp/lampp security


Important Files and Directories

The XAMPP commands home—>                 /opt/lampp/bin/
The Apache Document Root directory—>   /opt/lampp/htdocs/
The Apache configuration file—>                 /opt/lampp/etc/httpd.conf
The MySQL configuration file—>                /opt/lampp/etc/my.cnf
The PHP configuration file—>                       /opt/lampp/etc/php.ini
The ProFTPD configuration file—>              /opt/lampp/etc/proftpd.conf
The phpMyAdmin configuration file—>     /opt/lampp/phpmyadmin/

If you have any doubt about any post feel free to comment and get solved tham.


Gihan Malan De Silva.

How to install XAMPP on Linux (Ubuntu 11.04) Part #2

Ok this is the second part of the previous post.If you haven’t read the first part “How to install XAMPP on Linux (Ubuntu 11.04)” please read it before come to this 😀 . Today I’ll tell you how to configure MySQL databases (phpMyAdmin). Because is not set to your Linux username so,you are not still allowed to goto the phpMyadmin page.

First you should get open the terminal and login as root user.

Now press (Clrt+Alt+T) to open Terminal window
then type sudo -s -H

command: cd /opt/lampp/phpmyadmin

Now you are in the phpmyadmin directory, you need to change the ownership of the file to your own Linux username.

command:chown your_user_name:your_user_name

Ok now there is one thing to do.That’s Configure Linux XAMPP Security

In this case too you need to login as root user(only if already logout).Now lets set up the security.

command: /opt/lampp/lampp security

Then the terminal will be ask some questions , type “YES” to all and set password to all. Important thing is write them down in a safe place.

After configuring security the database configuration file alteration automatically happened ,so  you need to change the ownership back to your username as did earlier.

command: cd /opt/lampp/phpmyadmin

command:chown your_user_name:your_user_name

Now you are done with configuring XAMPP 😀 . Restart the XAMPP with this command

command: /opt/lampp/lampp restart

Now check out your overall installation process. First you need to clear your entire browsing history and cache.

Type this on your browser : http://localhost/ then click on “Status” link. If all the things are done correctly, you will see a message like this.

XAMPP Status

XAMPP Status

Now you should be able to login to phpMyAdmin without any trouble. Login with your MySQL username and password that you gave at security configuration.

Important! :

  • phpMyAdmin has to accounts for MySQL as user names root and pma, but both have one password, that you gave. If login as root user, you will be able to have all privileges. But if you log in as pma user privileges will be limited and you are not allowed to create databases (only create tables and access the database).
  • Do not overwrite or delete default files inside your htdocs, becasue they are very important.If you do s XAMPP may be crashed.


If you have any doubt about any post feel free to comment and get solved tham.


Gihan Malan De Silva.


How to install XAMPP on Linux (Ubuntu 11.04)

Hi, this is my second post.In first post I mentioned about how to run & configure XAMPP on windows computer. XAMPP may be the best server to PHP. Now its time to move into Linux. Currently I’m using Ubuntu 11.04 Natty Narwhal edition. Based on that I’ll show you how to install XAMPP on Linux OS.

Earlier day the Linux version of XAMPP called as LAMPP. But it comes as XAMPP with more improvements.

Ok, First of all you need to download the XAMPP for Linux form Apachi Friends.
here is the link for it :

Before installation , its better to have a MD5 check.To do that you need to login as root user.
1) Now press (Clrt+Alt+T) to open Terminal window
then type sudo -s -H
it will ask your password after that
2) type md5sum xampp-linux-1.7.4.tar.gz
the displaying MD5 should be 7d83c9829d8c79d43ea607e5b009dc58

3) Now you should extract the downloaded archive file to /pot directory

command: tar xvfz xampp-linux-1.7.4.tar.gz -C /opt

You shouldn’t use any extracting tool to extract the archive, it won’t work.And if you already installed a XAMPP version, it will overwritten by this command.Now XAMPP is installed below the /opt/lampp directory.

Now you can check whether XAMPP is working.

command: sudo /opt/lampp/lampp start
you will see a message like this

Ok now XAMPP is working 😀 .But still there is a problem. Your php testing folder is “htdocs”. You can simply move into it  File System–>opt–>lampp–>htdocs

You will noticed that it won’t allow you to put .php file or any thing. Because you haven’t owe the permission yet. Because it belongs to root user.

Change the ownership XAMPP to your user account!

In this case also you need to login as root user.
Now press (Clrt+Alt+T) to open Terminal window
command: sudo -s -H

Now move to lampp folder
command: cd /opt/lampp/

command: chown -R yourUserName:yourUserName htdocs

Important: Here yourUserName is just your user account name of Linux

Also you need to associate ownership of your Linux username with the Apache configuration. In this case move to “etc” folder:

command: cd /opt/lampp/etc/
Now you are in the etc directory. Type gedit httpd.conf. This will show the Linux text editor.

command: gedit httpd.conf

But be careful when editing; a single mistake can make the Apache web server inoperable.
Then find (press Ctrl+F) the following line in that text file..

The text file look like this…

User nobody

Group nogroup


Change this to:

User yourUserName

Group nogroup



A picture of the text file on my computer…

Now you can reboot the computer..
After that open the terminal (Ctrl+Alt+T)

then start XAMPP
command: sudo /opt/lampp/lampp start

Then go to firefox type this on address bar http://localhost/
It will take you to the XAMPP welcome page..
Now you can start programming php scripts.. put your PHP script files into “htdocs” folder as I mentioned earlier.
If your php script name is test.PHP ,type this on address bar of firefox.

If you are a beginner and want an test php script.Here it is…

See you in post with How to configure MySQL database (phpMyAdmin) in XAMPP

Enjoy it