nauty-catg - concatenate files of graphs

              Copy files to stdout with all but the first header removed.

       -x     Don't  write  a  header.   In  the absence of -x, a header is written if there is one in the first
              input file.

       -v     Summarize to stderr.

nauty 2.8.9                                      September 2024                                    NAUTY-CATG(1)

       nauty-catg - concatenate files of graphs

catg [-xv] [infile]...