NAME bcomps - biconnected components filter for graphs

SYNOPSIS bcomps [ -stvx? ] [ -ooutfile ] [ files ]

DESCRIPTION bcomps decomposes graphs into their biconnected components, printing the components to standard output.

OPTIONS The following options are supported:

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

-t Print the underlying block-cutvertex tree.

-x Each biconnected component is printed as a separate root graph.

-v Prints number of blocks and cutvertices.

-o outfile If specified, each root 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 block is written to a dif- ferent file. If outfile does not have a suffix, the nth block of the ith graph is written to outfile_n_i. However, the 0th block of the 0th graph is written to outfile.

If outfile has a suffix, i.e., has the form base.sfx, then the files will have the same name as above, except appended with .sfx.

The block-cutvertex tree of ith graph is written to outfile_n_T, with an appended suffix if specified.

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

OPERANDS 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.

RETURN CODES bcomps returns 0 if all the input graphs are biconnected; and non-zero if any graph has multiple blocks, or any error occurred.

BUGS It is possible, though unlikely, that the names used for connected com- ponents and their subgraphs may conflict with existing subgraph names.

AUTHORS Emden R. Gansner <erg@research.att.com>

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

18 November 2003 BCOMPS(1)