To name three
real uses I've made of [telnet] recently: [...]
You might find netcat useful.
Not sure if/which distribution has it
by default.
"Distribution"? Are you assuming I run Linux? (I don't, not on my own
machines. The Pi 3 was for work.)
I have a netcat, one of my own writing. It works reasonably well for
such things, yes. However, it is not present everywhere; when there is
a netcat present, its command line requires learning - if I can even
find the documentation for it. (And assuming there isn't an nc present
that is something completely different.)
Until I ran into that Raspbian, though, telnet had always (a) just been
there and (b) just worked with (c) the same command-line syntax.
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