Civil suit - caveat - how works

You can not prevent any one to appeal against any decree or orders of the court, as appeal is a creation of statues. Let appeal be filed first and you contest his appeal petition, no need for caveat.

Dear Nitin,

Filing Caveat will give you an opportunity to oppose the appeal at the admission stage itself by bringing in your points to the notice of the court.  Or, by bringing in your point of view to the court, you may persuade the court from passing any interim orders in favour of the appellant.  After all, it is for you to decide whether to file the caveat or not. (If anybody wants to save on the money payable to lawyer, one need not file caveat).

R.Ramachandran sir, do you mean caveat can be filed not only in original jurisdiction but in appellate jurisdiction? What about caveat by judgment debtor for attachment of movable property under Order XXI Rule 43?

Appeal proceedings can not be concluded on the basis of caveat. 

The main purpose of filling Caveat is to prevent any ex-parte order of stay or injunction against the order/decree passed by the trail court that the appellant will pray at the High Court at the time of filling appeal or revision. The High Court will first issue notice to the defendent/respondent before taking up case file for hearing by the bench for admission.