Thanks, Michael...
I'll try that imediately...
The problem is that I've been using the 4.0 version of grass and only a
week ago I've installed 4.2 ... 
Luís Franco
------------------------------------------
Instituto das Comunicações de Portugal
Av. Jose Malhoa, Lt. 12
1070 Lisboa
Portugal
The Grass command r.contour works fine...
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Michel Wurtz ENGEES - Laboratoire Territoires & Environnement
1, quai Koch - BP 1039, F-67070 STRASBOURG cedex
Tel: +33 03.88.24.82.45 Fax: +33 03.88.37.04.97