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tsort
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<p>The tsort program is a <a href="/facts/Command_line_interface/R9JpGmXQ">command line</a> utility on <a href="/facts/Unix/0pNL2seI">Unix</a> and <a href="/facts/Unix-like/YAKrAxzd">Unix-like</a> platforms, that performs a <a href="/facts/Topological_sorting/VY7gNtYA">topological sort</a> on its input. As of 2017<a href="https://en.wikipedia.org/w/index.php?title=Tsort&action=edit">[update]</a>, it is part of the <a href="/facts/POSIX/mQkSt234">POSIX</a>.1 standard. </p>