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.\" ========================================================================
.\"
.IX Title "TSORT 1"
.TH TSORT 1 "2001-06-06" "perl v5.20.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
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.SH "NAME"
tcsort \- topological sort
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  tcsort [filename]
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
.RS 2
Does a topological sort of input pairs.
.Sp
For a more complete description, see the \fItsort\fR\|(1) man page,
For an explanation of the algorithm,
see the \fIWork\fR column in the October, 1998, issue of SunExpert,
or the references given below.
.RE
.SH "OPTIONS AND ARGUMENTS"
.IX Header "OPTIONS AND ARGUMENTS"
.IP "\fB[\-b|\-d]\fR" 8
.IX Item "[-b|-d]"
breadth-first or depth-first (default) traversal
.IP "\fBfilename\fR" 8
.IX Item "filename"
Optional input file.
Input format is pairs of white-space-separated fields,
one pair per line.
Each field is the name of a node.
.Sp
Output is the topologically sorted list of nodes.
.Sp
Ignores lines without at least two fields.
Ignores all fields on the line except the first two.
.SH "AUTHOR"
.IX Header "AUTHOR"
.Vb 1
\&  Jeffrey S. Haemer
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fItsort\fR\|(1), \fItcsh\fR\|(1), \fItchrist\fR\|(1)
.PP
Algorithm stolen from Jon Bentley (\fIMore Programming Pearls\fR, pp. 20\-23),
who, in turn, stole it from Don Knuth
(\fIArt of Computer Programming, volume 1: Fundamental Algorithms\fR,
Section 2.2.3)