NAME

tsort − topological sort

SYNOPSIS

tsort [file]

DESCRIPTION

tsort produces on the standard output a totally ordered list of items consistent with a partial ordering of items mentioned in the input text file. If no file is specified, the standard input is understood.  tsort is generally used in conjunction with the lorder command to sort the objects to be installed in a library by ar (see lorder(1) and ar(1)).

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

EXTERNAL INFLUENCES

Environment Variables

LC_CTYPE determines the locale for the interpretation of text as single- and/or multi-byte characters. 

LC_MESSAGES determines the language in which messages are displayed. 

If LC_CTYPE or LC_MESSAGES is not specified in the environment or is set to the empty string, the value of LANG is used as a default for each unspecified or empty variable.  If LANG is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of LANG. 

If any internationalization variable contains an invalid setting, tsort behaves as if all internationalization variables are set to "C".  See environ(5).

International Code Set Support

Single- and multi-byte character code sets are supported. 

DIAGNOSTICS

Odd data
There is an odd number of fields in the input file.

WARNINGS

Libraries and object files cannot be tsorted directly. 

tsort uses a quadratic algorithm that is not considered worth fixing given its typical use of ordering a library archive file. 

SEE ALSO

lorder(1). 

STANDARDS CONFORMANCE

tsort: SVID2, SVID3, XPG2, XPG3, XPG4

Hewlett-Packard Company  —  HP-UX Release 10.20:  July 1996