programming arduino uno

Is there a possibility to program arduino uno via ethernet without using shield?
thank you

Short answer, no. To be more precise you do not need a shield, but you would need extra components.
What is it exactly that you want to do ?

@kavya_mc, please do not cross-post.

sorry sir, I didnot understand what is crossposting, sorry again for doing that.

sir, I want to control a pressure sensor through arduino by programming it through ethernet.

I am not sure what you mean by 'control a pressure sensor'. It is more normal to read a sensor. Is that what you mean ? Perhaps you could expand a bit more on what you want to do and what you have managed to do already.