Provided by: nauty_2.6r10+ds-1ubuntu1_amd64 bug

NAME
       nauty-catg - concatenate files of graphs


SYNOPSIS
       catg [-xv] [infile]...


DESCRIPTION
              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 2.6.10                                      February 2020                                    NAUTY-CATG(1)