It depends...
You can code Processing sketches in pure Java, see
how it is done in Eclipse, for example.
If you really want to stick to .pde files, there is now a command line tool, named processing-java.exe for example (for Windows, obviously), just next of processing.exe, that can compile and optionally run your code.
"
on computer where processing can be not installed"
You probably cannot do that, you need at least the core.jar and perhaps some core libraries, and some native libraries as well (OpenGL, Serial, etc.).
Now, if that's not the compilation step that really interest you, but rather the capability to run a sketch anywhere, you can export the sketch (see the File menu in the PDE).
You still need to have Java installed on the target computer.
