OK, I now moved to Linux completely. The thing is, in Mandrake, I downloaded the Java program. But there's a little thing: it's name ends with a .bin....meaning it's like: java.rpm.bin
Check this out
Command line in Linux- usually you have to go to "system" or something of that nature. I haven't dealt with Mandrake in a loooooooooong time, but it should be where sys tools is. To get there, you will have to have root priv. It's called a "terminal" instead of a command prompt- I think.