*nix Documentation Project
·  Home
 +   man pages
·  Linux HOWTOs
·  FreeBSD Tips
·  *niX Forums

  man pages->NetBSD man pages -> tsort (1)              



NAME    [Toc]    [Back]

     tsort - topological sort of a directed graph

SYNOPSIS    [Toc]    [Back]

     tsort [-l] [-q] [file]

DESCRIPTION    [Toc]    [Back]

     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 file, or from standard input if no file is

     Node names in the input are separated by white space and there must be an
     even number of node names.

     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

     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.

     The options are as follows:

     -l      Search for and display the longest cycle.  Can take a very long

     -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.

SEE ALSO    [Toc]    [Back]


HISTORY    [Toc]    [Back]

     A tsort command appeared in Version 7 AT&T UNIX.  This tsort command and
     manual page are derived from sources contributed to Berkeley by Michael
     Rendell of Memorial University of Newfoundland.

BSD                              April 1, 1994                             BSD
[ Back ]
 Similar pages
Name OS Title
tsort IRIX topological sort
tsort HP-UX topological sort
tsort Linux perform topological sort
tsort Tru64 Sorts an unordered list of ordered pairs (topological sort)
hwgraph IRIX hardware graph and hardware graph file system
lio_listio FreeBSD list directed I/O (REALTIME)
VkGraph IRIX A component that displays directed graphs
awk HP-UX pattern-directed scanning and processing language
nawk OpenBSD pattern-directed scanning and processing language
nawk FreeBSD pattern-directed scanning and processing language
Copyright © 2004-2005 DeniX Solutions SRL
newsletter delivery service