SHORTG(1)

NAME
shortg - Remove isomorphs from a file of graphs.

SYNOPSIS
shortg [-qvkdu] [-i# -I#:# -K#] [-fxxx] [-Tdir] [infile [outfile]]

DESCRIPTION

    Remove isomorphs from a file of graphs.

    If outfile is omitted, it is taken to be the same as infile If both infile and outfile are omitted, input will be taken

    from stdin and written to stdout

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

-s  force output to sparse6 format

-g  force output to graph6 format If neither -s or -g are given, the output format is determined by the header or, if there is none, by the format of the first input graph.

-k  output graphs have the same labelling and format as the inputs. Otherwise, output graphs have canonical labelling. -s and -g are ineffective if -k is given. If none of -sgk are given, the output format is determined by the header or, if there is none, by the format of the first input graph.

-v  write to stderr a list of which input graphs correspond to which output graphs. The input and output graphs are both numbered beginning at 1. A line like

    23 : 30 154 78

    means that inputs 30, 154 and 78 were isomorphic, and produced output 23.

-d  include in the output only those inputs which are isomorphic to another input. If -k is specified, all such inputs are included in their original labelling. Without -k, only one member of each nontrivial isomorphism class is written, with canonical labelling.

-fxxx
    Specify a partition of the point set. xxx is any

string of ASCII characters except nul.
    This string is

    considered extended to infinity on the right with the character 'z'. One character is associated with each point, in the order given. The labelling used obeys these rules:

    (1) the new order of the points is such that the associated

    characters are in ASCII ascending order

    (2) if two graphs are labelled using the same string xxx,

    the output graphs are identical iff there is an associated-character-preserving isomorphism between them.

-i# select an invariant (1 = twopaths, 2 = adjtriang(K), 3 = triples,

    4 = quadruples, 5 = celltrips, 6 = cellquads, 7 = cellquins, 8 = distances(K), 9 = indsets(K), 10 = cliques(K), 11 = cellcliq(K),

    12 = cellind(K), 13 = adjacencies, 14 = cellfano, 15 = cellfano2)

-I#:#
    select mininvarlevel and maxinvarlevel (default 1:1)

-K# select invararg (default 3)

-u  Write no output, just report how many graphs it would have output. In this case, outfile is not permitted.

-Tdir
    Specify that directory "dir" will be used for temporary disk

space by the sort subprocess.
    The default is usually /tmp.

-q  Suppress auxiliary output