tsort(1) [freebsd man page]

TSORT(1)						    BSD General Commands Manual 						  TSORT(1)

NAME

     tsort -- topological sort of a directed graph

SYNOPSIS

     tsort [-dlq] [file]

DESCRIPTION

     The tsort utility 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 given.

     There must be an even number of nodes in the input.  Node names specified on the same line should be white space separated.

     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.

     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:

     -d      Turn on debugging.

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

     -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

     ar(1)

HISTORY

     The 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.

BUGS

     The tsort utility does not recognize multibyte characters.

BSD
								 December 27, 2006							       BSD

tsort(1)							   User Commands							  tsort(1)

NAME

       tsort - topological sort

SYNOPSIS

       /usr/ccs/bin/tsort [file]

DESCRIPTION

       The  tsort command produces on the standard output a totally ordered list of items consistent with a partial ordering of items mentioned in
       the input file.

       The input consists of pairs of items (nonempty strings) separated by blanks. Pairs of different items indicate ordering. Pairs of identical
       items indicate presence, but not ordering.

OPERANDS

       The following operand is supported:

       file	A path name of a text file to order. If no file operand is given, the standard input is used.

EXAMPLES

       Example 1: An example of the tsort command

       The command:

       example% tsort <<EOF
       a b c c d e
       g g
       f g e f
       EOF

       produces the output:

       a
       b
       c
       d
       e
       f
       g

ENVIRONMENT VARIABLES

       See  environ(5) for descriptions of the following environment variables that affect the execution of tsort: LANG, LC_ALL, LC_CTYPE, LC_MES-
       SAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWbtool 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       lorder(1), attributes(5), environ(5), standards(5)

DIAGNOSTICS

       Odd data: there are an odd number of fields in the input file.

SunOS 5.10							    1 Feb 1995								  tsort(1)