Watch this: http://scala-ide.org/download/current.html
In principle the steps are:
1: go to http://scala-ide.org/ and download the version needed for your Linux 32 or 64-bit to your linux server/workstation. The latest version is 4.4.1.
2: meet JDK requirements: JDK 6, 7, or 8
3: copy the archive to your preferred folder and decompress.
4. find eclipse executable and execute it
5. follow the steps suggested in the splash screens
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