Eclipse is a multi-language Integrated development environment (IDE) comprising a base workspace and an extensible plug-in system for customizing the environment. It is written mostly in Java. It can be used to develop applications in Java and, by means of various plug-ins, other programming languages including Ada, C, C++, COBOL, Fortran, Haskell, JavaScript, Perl, PHP, Python, R, Ruby (including Ruby on Rails framework), Scala, Clojure, Groovy, Scheme, and Erlang. It can also be used to develop packages for the software Mathematica. Development environments include the Eclipse Java development tools (JDT) for Java and Scala, Eclipse CDT for C/C++ and Eclipse PDT for PHP, among others.

The initial codebase originated from IBM VisualAge.^[2] The Eclipse software development kit (SDK), which includes the Java development tools, is meant for Java developers. Users can extend its abilities by installing plug-ins written for the Eclipse Platform, such as development toolkits for other programming languages, and can write and contribute their own plug-in modules.

Released under the terms of the Eclipse Public License, Eclipse SDK is free and open source software (although it is incompatible with the GNU General Public License^[3]). It was one of the first IDEs to run under GNU Classpath and it runs without problems under IcedTea.

Ubuntu, here are some steps that help you getting Eclipse working on Ubuntu

1. Install Sun Java JDK

#sudo apt-get install sun-java6-jdk

2.  Download Eclipse
You can go to official site http://www.eclipse.org/downloads/ and choose your edition,

Save to your Desktop

3. Extract Eclipse
Open Terminal, and execute:

#cd ~/Desktop
#tar xzf eclipse-php-galileo-linux-gtk.tar.gz (replace your downloaded file name here)
#sudo mv eclipse /opt/eclipse
#sudo mv eclipse-galileo.png /opt/eclipse
#cd /opt
#sudo chown -R root:root eclipse
#sudo chmod -R 755 eclipse
#cd /opt/eclipse
#sudo chmod +x eclipse

4. Create a .desktop file to eclipse:

gedit ~/.local/share/applications/opt_eclipse.desktop

Then, paste this inside (dont forget to edit Exec and Icon values):

[Desktop Entry]
Type=Application
Name=Eclipse
Comment=Eclipse Integrated Development Environment
Icon=** something like /opt/eclipse/icon.xpm **
Exec= ** something like /opt/eclipse/eclipse **
Terminal=false
Categories=Development;IDE;Java;
StartupWMClass=Eclipse

After that, open that folder with nautilus:

nautilus ~/.local/share/applications

If you want to use this launcher outside dash/launcher (ex: as a desktop launcher) you need to add execution permission by right clicking the file and choosing Properties -> Permissions -> Allow execution, or, via the command-line:

chmod +x ~/.local/share/applications/opt_eclipse.desktop

Finally drop opt_eclipse.desktop to launcher.

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