The unrar command or gui tools are not supported out of the box. Use the following instructions install the same:

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unrar Command Line Tool

You need to download unrar by visiting this page and look for OS X version. Alternativly, you can open the terminal and type the following command to download the same:

      cd /tmp
curl -o output.tar.gz http://www.rarlab.com/rar/rarosx-3.9.3.tar.gz
    

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Untar the tar ball, enter:

      tar -zxvf output.tar.gz
    

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Sample outputs:

You need to copy rar and unrar command to /bin directory, type the following commands:

      sudo cp -v /tmp/rar/{rar,unrar} /bin
rm -rf /tmp/rar
    

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Sample outputs:

How Do I Use Unrar Command Line?

You can use the unrar command as follows:

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Task: Extract Files

The syntax is as follows to open or unrar file in current directory: ?

      unrar e file.rar
ls -l
    

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Task: List (l) File Inside Rar Archive ?

      unrar l file.rar
    

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Task: To Extract (x) Files With Full Path ?

      unrar x file.rar
    

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Task: To Test (t) Integrity Of Archive ?

      unrar t file.rar
    

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To see all support command line options type:

      unrar | less
    

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GUI App: The Unarchiver

You can use "The Unarchiver" is free software and it is a much more capable replacement for "BOMArchiveHelper.app", the built-in archive unpacker program in Mac OS X. The Unarchiver is designed to handle many more formats than BOMArchiveHelper, and to better fit in with the design of the Finder. Supported file formats include Zip, Tar-GZip, Tar-BZip2, RAR, 7-zip, LhA, StuffIt and many other more and less obscure formats. The goal is to make The Unarchiver able to extract anything you give it.
=> Download The Unarchiver

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來源：http://www.cyberciti.biz/faq/unrar-apple-os-x-command-line-gui-tools/

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