Hi Rochdi! curl is a software that can make http calls from a command line. 

Are you sure you need curl? Or maybe you need to make http calls from IRIS or Ensemble? 

There are plenty of examples.

E.g. here is a one line to make an http GET request and download  and install ZPM:

    s r=##class(%Net.HttpRequest).%New(),r.Server="pm.community.intersystems.com",r.SSLConfiguration="ISC.FeatureTracker.SSL.Config" d r.Get("/packages/zpm/latest/installer"),$system.OBJ.LoadStream(r.HttpResponse.Data,"c")

It is an example of http request