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`echo -e` should be easily replaceable with `printf` but nc remains to be a problem.



Is inetd "Posix"? It has command line switches to not fork, and to specify the config file. Maybe it takes a config file of "-" to mean stdin.


I doubt it. At least I can't find it anywere here:

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/c...




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