RAR For Linux.
RAR is an archive manager for the .rar format only. It can backup your data and reduce the size of email attachments, decompress RAR files downloaded from Internet and create new archives in the RAR file format.
They have really gone out of their way to cut costs in every corner, when they created this software. No GUI and no .zip file support etc.
Latest version: RAR 6.21 console version ( only CLI-version ) available for Linux.