Howto install scala in ubuntu from tar.gz

Quick'n'dirty instructions for installing scala in ubuntu

$ sudo mkdir -pf /usr/local/scala && cd /usr/local/scala
$ sudo wget http://www.scala-lang.org/files/archive/scala-2.10.2.tgz && sudo tar xvfz scala-2.10.2.tgz
$ sudo update-alternatives --install /usr/bin/scala scala /usr/local/scala/scala-2.10.2/bin/scala 1 --slave /usr/bin/scalac scalac /usr/local/scala/scala-2.10.2/bin/scalac --slave /usr/bin/scalap scalap /usr/local/scala/scala-2.10.2/bin/scalap --slave /usr/bin/scaladoc scaladoc /usr/local/scala/scala-2.10.2/bin/scaladoc --slave /usr/bin/fsc fsc /usr/local/scala/scala-2.10.2/bin/fsc
$ sudo echo 'SCALA_HOME=$(readlink -f /usr/bin/scala | sed "s:/bin/scala::")' > /etc/profile.d/scala.sh
$ sudo echo 'export SCALA_HOME' >> /etc/profile.d/scala.sh