This is the command tsortposix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
tsort — topological sort
SYNOPSIS
tsort [file]
DESCRIPTION
The tsort utility shall write to standard output a totally ordered list of items
consistent with a partial ordering of items contained in the input.
The application shall ensure that the input consists of pairs of items (non-empty strings)
separated by <blank> characters. Pairs of different items indicate ordering. Pairs of
identical items indicate presence, but not ordering.
OPTIONS
None.
OPERANDS
The following operand shall be supported:
file A pathname of a text file to order. If no file operand is given, the standard
input shall be used.
STDIN
The standard input shall be used if no file operand is specified, and shall be used if the
file operand is '−' and the implementation treats the '−' as meaning standard input.
Otherwise, the standard input shall not be used. See the INPUT FILES section.
INPUT FILES
The input file shall be a text file.
ENVIRONMENT VARIABLES
The following environment variables shall affect the execution of tsort:
LANG Provide a default value for the internationalization variables that are unset or
null. (See the Base Definitions volume of POSIX.1‐2008, Section 8.2,
Internationalization Variables for the precedence of internationalization
variables used to determine the values of locale categories.)
LC_ALL If set to a non-empty string value, override the values of all the other
internationalization variables.
LC_CTYPE 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).
LC_MESSAGES
Determine the locale that should be used to affect the format and contents of
diagnostic messages written to standard error.
NLSPATH Determine the location of message catalogs for the processing of LC_MESSAGES.
ASYNCHRONOUS EVENTS
Default.
STDOUT
The standard output shall be a text file consisting of the order list produced from the
partially ordered input.
STDERR
The standard error shall be used only for diagnostic messages.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
CONSEQUENCES OF ERRORS
Default.
The following sections are informative.
APPLICATION USAGE
The LC_COLLATE variable need not affect the actions of tsort. The output ordering is not
lexicographic, but depends on the pairs of items given as input.
EXAMPLES
The command:
tsort <<EOF
a b c c d e
g g
f g e f
h h
EOF
produces the output:
a
b
c
d
e
f
g
h
RATIONALE
None.
FUTURE DIRECTIONS
None.
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