Alright, I just can't take this any more. If someone wanted to run a simple google query, they'd run a simple google query! The whole point of asking questions on a forum board populated by actual human beings is to communicate with actual human beings. If all you have to say is "you should enter your request into a lookup-table that associates words with popular websites" (which is all that google is), I gotta say, why are you even here? Just let Google run your Maemo forum account, and go do something useful with your time...

On the original poster's topic: the world of the Unix command line is far more rich, varied, and honestly wild-west than the DOS world ever became. To start with, there isn't really just one command line: there are many different "shells", each with their own advocates. By default, Maemo is using a shell called "ash" that comes with the "busybox" package. (Here's the wikipedia link for ash.) You can also download a very popular shell called "bash", if you prefer.

If you're completely new to Unix shell scripts, it is probably more helpful to work through a tutorial of the basic concepts behind shells than to just try to memorize a few useful commands. This website provides a very basic introduction to the shell, but includes some useful information about file, I/O, and job controls that have many subtle differences from how DOS does things:

http://linuxcommand.org/learning_the_shell.php