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CCOMPS(1)                                                  CCOMPS(1)

       ccomps - connected components filter for graphs

       ccomps [ -sxv?  ] [ -ooutfile ] [ files ]

       ccomps  decomposes  graphs  into  their connected components,
       printing the components to standard output.

       The following options are supported:

       -s     No output graph is printed. Implies the -v flag.

       -x     Only the connected components are printed, as separate

       -v     Counts  of  nodes,  edges and connected components are

       -C     Use clusters in computing components  in  addition  to
              normal  edge  connectivity. In essence, this gives the
              connected components of the  derived  graph  in  which
              nodes  top-level  clusters  and  nodes in the original
              graph. This maintains all subgraph structure within  a
              component,  even  if  a  subgraph does not contain any

       -n     Do not project subgraph structure. Normally, if ccomps
              produces  components as graphs distinct from the input
              graph, it will define subgraphs which are  projections
              of  subgraphs  of  the input graph onto the component.
              (If the projection is empty, no subgraph is produced.)
              If  this  flag is set, the component contains only the
              relevant nodes and edges.

       -X node_name
              Prints  only  the  component   containing   the   node
              node_name, if any.

       -X# index
              Prints  only  component number index, if any, starting
              at 0.

       -o outfile
              If specified, each graph will be written to a  differ‐
              ent  file with the names derived from outfile. In par‐
              ticular, if both -o and -x flags are used,  then  each
              connected component is written to a different file. If
              outfile does not have a suffix, the  first  file  will
              have  the name outfile; then next outfile_1, then next
              outfile_2, and so on.  If outfile has a suffix,  i.e.,
              has  the  form  base.sfx, then the files will be named
              base.sfx, base_1.sfx, base_2.sfx, etc.

       By default, each input graph is printed, with each  connected
       component  given  as a subgraph whose name is a concatenation
       of the name of the input graph, the string "_component_"  and
       the number of the component.

       The following operand is supported:

       files   Names  of  files  containing  1 or more graphs in dot
               format.  If no files operand is specified, the  stan‐
               dard input will be used.

       Unless  used  to extract a single connected component, ccomps
       returns 0 if all the input graphs are connected; and non-zero
       if  any graph has multiple components, or any error occurred.
       If just extracting a single component, ccomps  returns  0  on
       success and non-zero if an error occurred.

       It is possible, though unlikely, that the names used for con‐
       nected components  and  their  subgraphs  may  conflict  with
       existing subgraph names.

       Stephen C. North <>
       Emden R. Gansner <>

       gc(1),  dot(1),  gvpr(1),  gvcolor(1), acyclic(1), sccmap(1),
       tred(1), libgraph(3)

                            21 March 2001                  CCOMPS(1)
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