Dear all,I'm looking for a free app able to convert in command line cad files (eg: dwg, slddrw) without open a dedicated software like autocad or another one .Best ragards

Good luck with that.

no link ?

Nope.  Couldn't find anything that matched your criteria of "app" and "without opening software" (i.e. - AutoCAD, etc.).

This app exists : http://www.datakit.com/en/cross_manager.php.But it is not free.However, it matches your other criteria: it can convert many CAD formats, it has an option to do batch conversions in command line, and it doesn't need to install or open other CAD software.You will not find a free software to do that.