> I saw inetutils has a rexec server but it is missing a rexec > client
No, it does have one: rsh. One of its various uses is acting as a rexec client. I cannot see anything in the code that tells me for sure that it can, just the service check assumes shell/tcp, ekshell/tcp or kshell/tcp, and exec/tcp is not used, and you cannot set the service.
