1994-05-27 12:33:43 +00:00
|
|
|
.\" Copyright (c) 1990, 1993, 1994
|
|
|
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" This manual is derived from one contributed to Berkeley by
|
|
|
|
|
.\" Michael Rendell of Memorial University of Newfoundland.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
|
|
|
.\" may be used to endorse or promote products derived from this software
|
|
|
|
|
.\" without specific prior written permission.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
.\" SUCH DAMAGE.
|
|
|
|
|
.\"
|
|
|
|
|
.\" @(#)tsort.1 8.3 (Berkeley) 4/1/94
|
1999-08-28 01:08:13 +00:00
|
|
|
.\" $FreeBSD$
|
1994-05-27 12:33:43 +00:00
|
|
|
.\"
|
2006-12-27 14:56:18 +00:00
|
|
|
.Dd December 27, 2006
|
1994-05-27 12:33:43 +00:00
|
|
|
.Dt TSORT 1
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm tsort
|
|
|
|
|
.Nd topological sort of a directed graph
|
|
|
|
|
.Sh SYNOPSIS
|
1997-08-18 07:28:50 +00:00
|
|
|
.Nm
|
2002-06-07 01:17:54 +00:00
|
|
|
.Op Fl dlq
|
1994-05-27 12:33:43 +00:00
|
|
|
.Op Ar file
|
|
|
|
|
.Sh DESCRIPTION
|
2002-04-20 12:18:28 +00:00
|
|
|
The
|
|
|
|
|
.Nm
|
|
|
|
|
utility takes a list of pairs of node names representing directed arcs in
|
1994-05-27 12:33:43 +00:00
|
|
|
a graph and prints the nodes in topological order on standard output.
|
|
|
|
|
Input is taken from the named
|
|
|
|
|
.Ar file ,
|
|
|
|
|
or from standard input if no file
|
|
|
|
|
is given.
|
|
|
|
|
.Pp
|
2006-12-27 14:56:18 +00:00
|
|
|
There must be an even number of nodes in the input.
|
|
|
|
|
Node names specified on the same line should be white space separated.
|
1994-05-27 12:33:43 +00:00
|
|
|
.Pp
|
|
|
|
|
Presence of a node in a graph can be represented by an arc from the node
|
|
|
|
|
to itself.
|
|
|
|
|
This is useful when a node is not connected to any other nodes.
|
|
|
|
|
.Pp
|
|
|
|
|
If the graph contains a cycle (and therefore cannot be properly sorted),
|
|
|
|
|
one of the arcs in the cycle is ignored and the sort continues.
|
|
|
|
|
Cycles are reported on standard error.
|
|
|
|
|
.Pp
|
|
|
|
|
The options are as follows:
|
2006-12-27 14:56:18 +00:00
|
|
|
.Bl -tag -width indent
|
1996-06-10 16:12:43 +00:00
|
|
|
.It Fl d
|
|
|
|
|
Turn on debugging.
|
2001-07-15 08:06:20 +00:00
|
|
|
.It Fl l
|
1994-05-27 12:33:43 +00:00
|
|
|
Search for and display the longest cycle.
|
|
|
|
|
Can take a very long time.
|
1996-08-02 04:50:44 +00:00
|
|
|
.It Fl q
|
2004-07-02 22:22:35 +00:00
|
|
|
Do not display informational messages about cycles.
|
|
|
|
|
This is primarily
|
1996-08-02 04:50:44 +00:00
|
|
|
intended for building libraries, where optimal ordering is not critical,
|
|
|
|
|
and cycles occur often.
|
1994-05-27 12:33:43 +00:00
|
|
|
.El
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr ar 1
|
|
|
|
|
.Sh HISTORY
|
2006-12-27 14:56:18 +00:00
|
|
|
The
|
1994-05-27 12:33:43 +00:00
|
|
|
.Nm
|
|
|
|
|
command appeared in
|
|
|
|
|
.At v7 .
|
|
|
|
|
This
|
1997-08-18 07:28:50 +00:00
|
|
|
.Nm
|
1994-05-27 12:33:43 +00:00
|
|
|
command and manual page are derived from sources contributed to Berkeley by
|
2006-12-27 14:56:18 +00:00
|
|
|
.An Michael Rendell
|
|
|
|
|
of Memorial University of Newfoundland.
|
2004-07-03 01:28:21 +00:00
|
|
|
.Sh BUGS
|
|
|
|
|
The
|
|
|
|
|
.Nm
|
|
|
|
|
utility does not recognize multibyte characters.
|
