tsort — perform topological sort
Perform a topological sort consistent with a partial sort per line of input separated by blanks:
tsort [OPTION] [FILE]
Write totally ordered list consistent with the partial ordering in FILE.
With no FILE, or when FILE is -, read standard input.
display this help and exit
output version information and exit
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
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Copyright © 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
Full documentation <https://www.gnu.org/software/coreutils/tsort>
or available locally via: info '(coreutils) tsort invocation'