Alright then, you can use:
$ tool -T png in -o out
at the command-line, to run tool to render a PNG of your graph file in to out.
There are a few command-line tools GraphViz provides. Here's the most used ones:
dot — hierarchial graphs. Usually for directed graphs, which have a flow to them.neato — symmetric graphs. Usually for non-directed graphs.dot is the most common one — when in doubt, use it. For simplicity, I use dot in examples throughout this page and the rest of the guide.
twopi — radial graphs, with some node of origin.circo — graphs laid out on a circle.fdp — symmetric graphs with 90° angles.sfdp — like fdp, but works faster with large graphs.patchwork — "squarified" tree maps.osage — array-like graphs, drawn with a cluster structure.