Re: simply preserving sessions across disconnect

On 30/06/2011 19:13, Adam Kellas wrote:
> On Thu, Jun 30, 2011 at 6:01 AM, Rich Boyce<rich-jcUp+/l53Jxaa/[email protected]>  wrote:
>> That's precisely how I use screen. The way I do it is to have a snippet in
>> my bash login script which tests whether the scripts is running in screen
>> already, and if not runs 'screen -RR':
>>
>> if [ ! $WINDOW ] ; then   # we're not already in screen
>>         if [ -e `which screen` ]; then  # we've got screen available
>>                 screen -RR       # reattach to first available session
>>                 exit             # logout when finished
>>         fi
>> fi
>>
>> Note that I'm working in a networked environment where my home area is the
>> same on my local workstation and all the servers I connect to.
>>
>> That works just how you're describing what you want. It's transparent during
>> normal use, but if the connection to the remote server is lost then the
>> session is restored upon reconnect.
> Rich,
>
> I'd be happy with a solution like this but can't see how it would work
> for me. How could $WINDOW ever be set at initial login?
It isn't, which is why screen gets launched. The ! means 'not' - so the 
initial 'if' is equivalent to 'if there is no $WINDOW variable'. Screen 
then launches (and sets $WINDOW), which starts another instance of bash, 
which runs this login script. This time, since $WINDOW is not false, 
another screen is not launched and instead I can use the bash session.

All this only works if you put it in your login script, probably .bashrc 
would work for you. Perhaps that's where the trouble's coming from: 
you're asking Putty to run the screen command but maybe it would work 
better if that was handled by your login script?

Rich