Hi Lars,
On Sat, Mar 05, 2016 at 08:23:42PM +0200, Lars Noodén wrote:
> 1) Here screen(1) is launched.
>
> ssh -l fred server.example.org screen
ssh lacks a -t option in this example (and the next one). Screen needs
a (pseudo) terminal.
> Once a screen(1) session is running, it is possible to detach it and
> close the SSH connection without disturbing the background processes it
> may be running. Then the terminal session can be reattached in progress.
>
> ssh -l fred server.example.org "screen -x"
"screen -x" works, but is probably not what most people use as it
connects to a screen session in addition to existing clients which
often restricts one of the clients to a smaller terminal than
available for him.
I usually use "screen -dr" for that:
-d = detach an attached session
-r = reattach the session here
What I do is usually
ssh -l fred server.example.org screen -Rd
-R = reattach if a session exists or creates a new session if no
session exists.
That way you only need one command for both purposes listed above.
This is especially nice for making shell aliases or so.
> 2) Here ssh(1) is to assume that the connection is broken after 5
> seconds of not being able to reach the server and to exit.
>
> while ! ssh -t f...@example.org -o 'ServerAliveInterval 5' \
> screen -d -RR; do true; done
There's a nice tool which does this a little bit more intelligent:
http://www.harding.motd.ca/autossh/
Combined with the above, I use it in a shell function like this:
asc () {
print -Pn "\e]0;%n@%m: autossh -t $* 'screen -RdU'\a"
autossh -x -t "$@" 'screen -RdU'
}
asc stands for "autossh + screen"
I.e. I just call "asc f...@server.example.org" and I do get a screen
session, either an existing one or a fresh one. In production for like
5 years now on a daily base -- also helps to survive setting the
laptop to sleep and waking it up at a different location with a
differnt IP address.
(And yes, there's also mosh. But the above has also the advance that I
can add any port forwardings or other SSH options and they're used
upon every reinstantiation of the connection again.)
HTH.
Kind regards, Axel
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