To work with Drupal 8, we need Drush 7, which is in alpha stage of development. So there no package available for distribution (like Ubuntu, OpenSuse). Installation of Drush 7 is not as simple Drush 6, if you not familiar with composer, you may find it difficult to install, so I've written a shell script, which can be used to install Drush 7.
This script install drush 7 for normal user, you don't need root access to run it.
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