Line mode goes back to BSD 4.x days, and it's useful over high latency
links --- i.e., the sort of thing that you get with stone age cellular
data networks (i.e., the sort of thing that we still have the US),
amateur packet radio links, etc. So it's certianly a nice to have, if
someone is willing to support it and the maintenance burden on the
rest of the tty stack isn't too onerous.
OTOH, one could argue that with something like mosh, if you can get
that working across a particular firewall, it solves the probably much
more portably without requiring kernel hacks. Mosh couldn't be used
on amateur packet links, since it uses encryption, which is verboten
for ham radio. But for other high latency links, mosh does work
fairly well, without requiring EXTPROC in the kernel.
- Ted
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