How to join two .avi files
So, you've just downloaded what you thought was going to be one file only to find out it's actually spit into numerous files like cd1.avi, cd2.avi.
How do you join them together easily?
The first way is to spend some of your hard earned cash any buy a package with a flashy front end or simply use what's built into mac os x - cat :-)
Firstly open a terminal window and cd to the folder that contains your files.
Then enter the following command
cat file1.avi file2.avi > my file.avi
Replace the names with something sensible - you get the idea. That's it! Easy.