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Re: Detect whether attached or detached from screen session?

From: Peder Stray
Subject: Re: Detect whether attached or detached from screen session?
Date: Tue, 14 Oct 2008 07:15:50 +0200 (CEST)
User-agent: Alpine 2.00 (LRH 1167 2008-08-23)

On Tue, 14 Oct 2008, Trent W. Buck wrote:

"Sven Hazejager"
<address@hidden> writes:

I'm using screen to keep some applications open over a remote SSH
connection that sometimes is killed. What I would like to do, is to
somehow find out whether I am logged in (attached) or disconnected
from the screen session.

Reason is that I want procmail to send incoming mail to my BlackBerry
if I'm disconnected, but NOT do that when I'm SSH-ing into my Pine

I don't know how to achieve that, but perhaps there's a different approach to the problem -- such as always forwarding all mail to an IMAP server that you can access from both the blackberry and from pine.

The screen-socket has execute permissions when attached, and none when detached, like this:


ls -l /tmp/uscreens/S-peder/4598.irc
prwx------ 1 peder peder 0 Oct 14 00:00 /tmp/uscreens/S-peder/4598.irc

ls -l /tmp/uscreens/S-peder/4598.irc
prw------- 1 peder peder 0 Oct 14 07:06 /tmp/uscreens/S-peder/4598.irc

Guess you can test for that i procmail by something like:

*? perl -e 'exit ! grep { (stat $_)[2] & 0100 } </tmp/uscreens/S-peder/*>'

  Peder Stray

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