If you have followed the installation instructions, you should now have the startup script R in a directory in your path .
Most people start using R interactively , which means entering commands.
For those of you who got here through something like DOS or UNIX, this will be pretty familiar. You type in the name of the command and, if the syntax is correct, it happens. The command line in R will act like any other command line on your system. One thing that annoys some people is having the same key strokes do different things in different applications. Ergonomically, it's better to use the same response to do the same thing.