I've tried following the program's built-in instructions (although I would consider them to be pretty cryptic) and the way I use it is a follows:
<BLOCKQUOTE><B>unrar x [filename.rar] [filename.avi]</B></BLOCKQUOTE>Obviously, the 'unrar' is needed to run the program. The 'x' determines use of exact filepath (or something like that) and seems to make the program work when otherwise it didn't for me. The [filename.rar] is the name of the rar file you'll open to decode this RAR. The [filename.avi] is the name you want the resulting file save as.
Here's an example using a RAR file group named example.rar (including example.r00, example.r01, and so forth) and a resulting file called example.mpg:
<BLOCKQUOTE><B>unrar x example.rar example.mpg</B></BLOCKQUOTE>It's possible you'll get a message while it chews on the first RAR segment that says something like, "ignoring 'example_movie.mpg'." This just means the RAR file was encoded expecting to use the name 'example_movie.mpg' and you're telling it to output to a different name. I'm not sure if this causes a problem or not, so I just stop the process (ctrl-c) and change the resulting filename to what the program is expecting (in this case 'example_movie.mpg'):
<BLOCKQUOTE><B>unrar x example.rar example_movie.mpg</B></BLOCKQUOTE>I've had hit-and-miss luck getting this program to work. Sometimes it works beautifully. Sometimes you're working with a bad collection or RAR segments. Sometimes it just doesn't see any data to decode (although a Windows unRAR program finds it perfectly).
Also, make sure to enclose the name or filepath of the [filename.rar] or [filename.mpg] in single quotes if there are any spaces included:
<BLOCKQUOTE><B>unrar x 'example with spaces.rar' 'example with spaces.mpg'</B></BLOCKQUOTE>Best of luck.