Man page - nauty-planarg(1)

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Package: nauty
apt-get install nauty

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nauty-planarg - test graphs for planarity and find embeddings or obstructions

planarg [ -v ] [ -nVq ] [ -p|-u ] [ infile [ outfile ]]

For each input, write to output if planar.

The output file has a header if and only if the input file does.

	-v		Write non-planar graphs instead of planar graphs
	-V		Write report on every input
	-u		Don’t write anything, just count
	-p		Write in planar_code if planar (without -p , same format as input)
	-P		Like -p but big-endian (same for <= 255 vertices)
	-k		Follow each non-planar output with an obstruction in sparse6 format (implies -v , incompatible with -p )
	-n		Suppress checking of the result
	-q		Suppress auxiliary information

This program permits multiple edges and loops