Usage: /usr/bin/tsort [OPTION] [FILE]
Write totally ordered list consistent with the partial ordering in FILE.

With no FILE, or when FILE is -, read standard input.

      --help
         display this help and exit
      --version
         output version information and exit

Report bugs to: <bug-coreutils@gnu.org>.
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
Full documentation <https://www.gnu.org/software/coreutils/tsort>
or available locally via: info '(coreutils) tsort invocation'