My way to Install unrar and rar in Mac OS

1. Download the correct version of Winrar from www.rarlab.com, and run the downloaded file to extract the package.
2. Use OnyX change the parameters of the finder to show hidden files on your Mac.
3. Locate and copy binary files unrar and rar to your bin folder (Macintosh HD/bin).
4. Change the finder parameters back to hide the hidden files.
5. Suppose you have a folder named “EXAMPLE” want to compress.
6. Launch terminal and go into this folder “EXAMPLE” and type

rar a EXAMPLE

And a rar file named EXAMPLE.rar will be in the folder after finish.
7. You also can compress the file into specific size by using the -v parameter,

rar a -v[size] EXAMPLE

Here the size is in KB
8. Use the following command to uncompress a compressed file:

unrar e EXAMPLE.rar