Graphviz: change font for the whole graph?

Question

I am wondering if I can define an alternative font for the whole graph.

...
digraph script_concept {
graph [layout=\"dot\",fontname=\"helvetica\"];
...
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Answer 1

Not sure if this is a recent update, but you can change these at the command-line level using the -G, -E and -N attribute flags. That is, the following works for me:

$ dot -Tpng -Nfontname=Roboto -Nfontsize=10 \
    -Efontname=Roboto -Efontsize=10 \
    tree.dot > tree.png