In computing science, RAR is an archive file format that supports data compression, error recovery, and file spanning. It was developed by a Russian software engineer Eugene Roshal (hence the name RAR: Roshal ARchive) and currently licensed by Win.RAR GmbH.
How to install
Type in a terminal:
~$ sudo apt-get install rar unrar
Now you are allowed to unrar archive file with graphical tools (Ark etc.) and terminal commands.
How to use unrar in a terminal
Unpack a file in current directory type command:
~$ unrar e file.rar
List (l) file inside rar archive:
~$ unrar l file.rar
To extract (x) files with full path type command:
~$ unrar x file.rar
To test (t) integrity of archive, file type command:
~$ unrar t file.rar