sunos man page for tsort

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)