acyclic [ -nv? ] [ -o outfile ] [ file ]
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 origi-
nal edge. The optional file argument specifies where the the input
graph is stored; by default, the program reads from stdin.
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.
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.
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.
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.
Stephen C. North <email@example.com>
Emden R. Gansner <firstname.lastname@example.org>
gc(1), dot(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), tred(1), lib-
21 March 2001 ACYCLIC(1)
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