Before installing Scala manually, choose your preferred version of Scala and download the corresponding .tgz file of that version Scala-verion.tgz from http://www.Scala-lang.org/download/. After downloading your preferred version of Scala, extract it as follows:

$ tar xvf scala-2.11.8.tgz

Then, move it to /usr/local/share as follows:

$ sudo mv scala-2.11.8 /usr/local/share

Now, to make the installation permanent, execute the following commands:

$ echo "export SCALA_HOME=/usr/local/share/scala-2.11.8" >> ~/.bash_profile
$ echo "export PATH=$PATH: $SCALA_HOME/bin" >> ~/.bash_profile 

That's it. Now, let's see how it can be done on Linux distributions like Ubuntu in the next subsection.