Usage: 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

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Full documentation <https://www.gnu.org/software/coreutils/tsort>
or available locally via: info '(coreutils) tsort invocation'