opensolaris man page for tsort

tsort(1)							   User Commands							  tsort(1)

NAME
       tsort - topological sort

SYNOPSIS
       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 (non-empty strings) separated by blanks. Pairs of different items indicate ordering. Pairs of  identi-
       cal 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 5.11							    28 Jun 2007 							  tsort(1)