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CCOMPS(1)										CCOMPS(1)

       ccomps - connected components filter for graphs

       ccomps [ -sxvenzC?  ] [ -X[#]s[-f] ] [ -ooutfile ] [ files ]

       ccomps decomposes graphs into their connected components, printing the components to stan-
       dard output.

       The following options are supported:

       -e     Do not induce edges in the connected components.

       -s     No output graph is printed. The return value can be used to check if the	graph  is
	      connected or not.

       -x     Only the connected components are printed, as separate graphs.

       -v     Counts of nodes, edges and connected components are printed.

       -z     Sort  components	by size, with the largest first. This is only effective if either
	      -x or -X# is present.  Thus, -zX#0 will cause the largest component to be printed.

       -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 nodes.

       -n     Do  not  project	subgraph  structure.  Normally,  if ccomps produces components as
	      graphs distinct from the input graph, it will define subgraphs  which  are  projec-
	      tions  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# start

       -X# start-

       -X# start-last
	      Prints  only  components	in the given range. In the first form, only the component
	      whose index is start, if any, is printed.  In the second form, each component whose
	      index  is  at least start is printed. In the last form, only those components whose
	      indices are in the range [Istart,last] are printed.  Thus, the flag -x  is  equiva-
	      lent to -X#0-.

       -o outfile
	      If specified, each graph will be written to a different file with the names derived
	      from outfile. In particular, 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 "_cc_" 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 standard 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 connected  components  and  their
       subgraphs may conflict with existing subgraph names.

       Stephen C. North <north@research.att.com>
       Emden R. Gansner <erg@research.att.com>

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

					  30 April 2011 				CCOMPS(1)
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