Converter shapefile for grads format

[Ranyére Nóbrega]

Can I convert a file SHP (shapefile format Surfer, for exemple)  for a
map in grads format? If yes, how do?
I need, as well, put a point  (for exemple, city) in grads, how do?
Thanks

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Ranyére Silva Nóbrega
Analista Intelectual
Divisão de Meteorologia e Climatologia - SIPAM
Centro Técnico e Operacional de Porto Velho