NAME

       nauty-shortg - remove isomorphs from a file of graphs

SYNOPSIS

       shortg [-qvkdu] [-i# -I#:# -K#] [-fxxx] [-S|-t] [-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

       -z     force output to digraph6 format If none of -s, -z, -g are given, the output format  is  determined
              by  the  header  or,  if  there is none, by the format of the first input graph. The output format
              determines the sorting order too.  As an  exception,  digraphs  are  always  written  in  digraph6
              format.

       -S     Use  sparse  representation  internally. Note that this changes the canonical labelling.  Multiple
              edges are not supported.  One loop per vertex is ok.

       -t     Use Traces.  Note that this changes the canonical labelling.  Multiple edges,loops, directed edges
              are not supported, nor invariants.

       -k     output graphs have the same labelling and format as the inputs.  Without -k,  output  graphs  have
              canonical labelling.  -s, -g, -z are ineffective if -k is given.

       -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, 16 = refinvar(K))

       -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.

       -Z# Specify memory for sorting (number followed by %,K,M, or G)

       -q     Suppress auxiliary output

nauty 2.8.8                                        April 2024                                    NAUTY-SHORTG(1)