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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "TSORT" 1P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" tsort 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+tsort \- topological sort
+.SH SYNOPSIS
+.LP
+\fBtsort\fP \fB[\fP\fIfile\fP\fB]\fP\fB\fP
+.SH DESCRIPTION
+.LP
+The \fItsort\fP utility shall write to standard output a totally ordered
+list of items consistent with a partial ordering of
+items contained in the input.
+.LP
+The application shall ensure that the input consists of pairs of items
+(non-empty strings) separated by <blank>s. Pairs of
+different items indicate ordering. Pairs of identical items indicate
+presence, but not ordering.
+.SH OPTIONS
+.LP
+None.
+.SH OPERANDS
+.LP
+The following operand shall be supported:
+.TP 7
+\fIfile\fP
+A pathname of a text file to order. If no \fIfile\fP operand is given,
+the standard input shall be used.
+.sp
+.SH STDIN
+.LP
+The standard input shall be a text file that is used if no \fIfile\fP
+operand is given.
+.SH INPUT FILES
+.LP
+The input file named by the \fIfile\fP operand is a text file.
+.SH ENVIRONMENT VARIABLES
+.LP
+The following environment variables shall affect the execution of
+\fItsort\fP:
+.TP 7
+\fILANG\fP
+Provide a default value for the internationalization variables that
+are unset or null. (See the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, Section 8.2, Internationalization Variables
+for
+the precedence of internationalization variables used to determine
+the values of locale categories.)
+.TP 7
+\fILC_ALL\fP
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.TP 7
+\fILC_CTYPE\fP
+Determine the locale for the interpretation of sequences of bytes
+of text data as characters (for example, single-byte as
+opposed to multi-byte characters in arguments and input files).
+.TP 7
+\fILC_MESSAGES\fP
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written to standard
+error.
+.TP 7
+\fINLSPATH\fP
+Determine the location of message catalogs for the processing of \fILC_MESSAGES
+\&.\fP
+.sp
+.SH ASYNCHRONOUS EVENTS
+.LP
+Default.
+.SH STDOUT
+.LP
+The standard output shall be a text file consisting of the order list
+produced from the partially ordered input.
+.SH STDERR
+.LP
+The standard error shall be used only for diagnostic messages.
+.SH OUTPUT FILES
+.LP
+None.
+.SH EXTENDED DESCRIPTION
+.LP
+None.
+.SH EXIT STATUS
+.LP
+The following exit values shall be returned:
+.TP 7
+\ 0
+Successful completion.
+.TP 7
+>0
+An error occurred.
+.sp
+.SH CONSEQUENCES OF ERRORS
+.LP
+Default.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+The \fILC_COLLATE\fP variable need not affect the actions of \fItsort\fP.
+The output ordering is not lexicographic, but
+depends on the pairs of items given as input.
+.SH EXAMPLES
+.LP
+The command:
+.sp
+.RS
+.nf
+
+\fBtsort <<EOF
+a b c c d e
+g g
+f g e f
+h h
+EOF
+\fP
+.fi
+.RE
+.LP
+produces the output:
+.sp
+.RS
+.nf
+
+\fBa
+b
+c
+d
+e
+f
+g
+h\fP
+.fi
+.RE
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+None.
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .