Not to execute any graph if the file in a directory is zero bytes Post: 302459279

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acyclic

ACYCLIC(1)						      General Commands Manual							ACYCLIC(1)

NAME

       acyclic - make directed graph acyclic

SYNOPSIS

       acyclic [ -nv?  ] [ -o outfile ] [ file ]

DESCRIPTION

       acyclic	is  a filter that takes a directed graph as input and outputs a copy of the graph with sufficient edges reversed to make the graph
       acyclic. The reversed edge inherits all of the attributes of the original edge. The optional file argument specifies where  the	the  input
       graph is stored; by default, the program reads from stdin.

OPTIONS

       The following options are supported:

       -n     No output is produced, though the return value will indicate whether the graph is acyclic or not.

       -v     Print information about whether the file is acyclic, has a cycle or is undirected.

       -o outfile
	      causes the output to be written to the specified file; by default, output is written to stdout.

       -?     option causes the program to print usage information.

RETURN CODES

       acyclic returns 0 if the graph is acyclic; 1 if the graph has a cycle; 2 if the graph is undirected; and 255 if there are any errors.

BUGS

       If the graph is strict and there is a cycle of length 2, the attributes of the reversed edge are lost.

       Some edge attributes are non-symmetric, referring to either the head or tail node. At present, there is no mechanism or convention for cor-
       rectly switching or renaming these.

AUTHORS

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

SEE ALSO

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

								   21 March 2001							ACYCLIC(1)

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