AB>> In fact, most Unix utilities will exit when losing the control terminal.
Depends on what do you mean on "losing". If you do the following:
run ftp
background it while it's busy (i.e., not reading from terminal, like in
downloading)
desintegrate parent shell process (like kill -9)
then ftp will happily survive. You'll lose any communication ability to
it, though, and it will exit as soon as it tries to read user input
(like, on finishing download). So it's practical to use screen when
available.
The point is that the absence of the controlling terminal by itself won't
kill ftp, it's the shell that is losing it would. If you prevent shell
from touching ftp, it will happily proceed until it needs terminal by
itself. Then it discovers that it's gone and will decide what to do.
--
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