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Re: Reattaching to a detached screen

From: Trent W. Buck
Subject: Re: Reattaching to a detached screen
Date: Fri, 02 Jan 2009 01:26:13 +1100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

Andrew Schulman
<address@hidden> writes:

>>    autossh -M 0 -t RemotePC "screen -e^Yy -D -R -S `uname -n`2RemotePC-$NEXT"
> <snip>
>> What I would like to be able to do is to attach to this screen from a
>> new shell in RemotePC, or a new screen launched from MyPC, such that
>> the deattached screen now becomes attached AND the new shell or screen
>> disappears, with the reattached screen taking its place.
>>     Reattaching is easy - there are several screen options that
>> accomplish that. It's getting rid of the new, supporting process
>> (shell or screen) that I just can't pull off. Is this doable in a
>> simple way?
> I do something similar to this.  Instead of logging in and running screen, I 
> log
> in with bash as usual, and then at some point in my .bash_profile I run
> exec screen -RD ...

Here's mine.  HTH, HAND.  twb-agents is basically simplified clone of
Gentoo's keychain.

## The naive "chsh -s /usr/bin/screen" breaks scp (and other things).
## Have sh start screen automatically "when appropriate".  That is,
## 1) not in a screen window (STY);
## 2) stdin is a tty;
## 3) screen is installed; and
## 4) terminal is capable of displaying screen.
## Replace "$STY" with "$STY$SSH_CLIENT$SSH_ORIGINAL_COMMAND" to avoid
## nesting screens when sshing (untested).
test -z "$STY" -a -t 0 &&
{ which screen && tput clear && tput cup && ! tput hc && ! tput os
} &>/dev/null &&              # ignore boring, expected error messages
    ## Set the window title to the host name.
    ## Note that using echo -e \e for ^[ is not portable.
    case "$TERM" in
        screen*) printf %bk%s%b%b \\033 "${HOSTNAME%%.*}" \\033 \\0134;;
    ## If new session, start agents.
    screen -ls | grep -qi 'No Sockets found' &&
    eval "$(twb-agents)"
    ## Start screen.
    exec screen -DRR

## If execution reaches this point, screen isn't the login shell.  In
## that case, if this is a bash shell, it's a good idea to do the
## bashisms in .bashrc.
test -n "$BASH" &&
test -f ~/.bashrc &&
. ~/.bashrc

> This replaces the original bash login shell with the reattached screen 
> process.
> Detaching from the screen then immediately logs me out.
> Andrew.

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