Scala Install in Ubuntu

root@mypod:~# sudo add-apt-repository ppa:webupd8team/java
root@mypod:~# sudo apt-get update
root@mypod:~# sudo apt-get install oracle-java7-installer

root@mypod:~# sudo wget http://www.scala-lang.org/files/archive/scala-2.9.3.tgz
root@mypod:~# sudo tar zxf scala-2.9.3.tgz
root@mypod:~# sudo mv scala-2.9.3.tgz /usr/share/scala
root@mypod:~# sudo ln -s /usr/share/scala/bin/scala /usr/bin/scala 
root@mypod:~# sudo ln -s /usr/share/scala/bin/scalac /usr/bin/scalac 
root@mypod:~# sudo ln -s /usr/share/scala/bin/fsc /usr/bin/fsc 
root@mypod:~# sudo ln -s /usr/share/scala/bin/sbaz /usr/bin/sbaz 
root@mypod:~# sudo ln -s /usr/share/scala/bin/sbaz-setup /usr/bin/sbaz-setup 
root@mypod:~# sudo ln -s /usr/share/scala/bin/scaladoc /usr/bin/scaladoc 
root@mypod:~# sudo ln -s /usr/share/scala/bin/scalap /usr/bin/scalap 

Create a file called HelloWorld.scala using your favorite text editor. It should contain this:

object HelloWorld {
  def main(args: Array[String]) {
    println("Hello, world!")
  }
}

scalac will compile this for you, and scala will run it.

root@mypod:~# scalac HelloWorld.scala 
root@mypod:~# scala HelloWorld