6578739ddb
track.
The $Id$ line is normally at the bottom of the main comment block in the
man page, separated from the rest of the manpage by an empty comment,
like so;
.\" $Id$
.\"
If the immediately preceding comment is a @(#) format ID marker than the
the $Id$ will line up underneath it with no intervening blank lines.
Otherwise, an additional blank line is inserted.
Approved by: bde
93 lines
3.3 KiB
Groff
93 lines
3.3 KiB
Groff
.\" 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.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 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
|
|
.\" $Id$
|
|
.\"
|
|
.Dd April 1, 1994
|
|
.Dt TSORT 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm tsort
|
|
.Nd topological sort of a directed graph
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl d
|
|
.Op Fl l
|
|
.Op Fl q
|
|
.Op Ar file
|
|
.Sh DESCRIPTION
|
|
.Nm Tsort
|
|
takes a list of pairs of node names representing directed arcs in
|
|
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
|
|
Node names in the input are separated by white space and there must
|
|
be an even number of nodes.
|
|
.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:
|
|
.Bl -tag -width Ds
|
|
.It Fl d
|
|
Turn on debugging.
|
|
.It Fl l
|
|
Search for and display the longest cycle.
|
|
Can take a very long time.
|
|
.It Fl q
|
|
Do not display informational messages about cycles. This is primarily
|
|
intended for building libraries, where optimal ordering is not critical,
|
|
and cycles occur often.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr ar 1
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
command appeared in
|
|
.At v7 .
|
|
This
|
|
.Nm
|
|
command and manual page are derived from sources contributed to Berkeley by
|
|
Michael Rendell of Memorial University of Newfoundland.
|