Checking for Exisiting Screen+Irssi Sessions on login

[kary]

I'm trying to create a login script for someone who is not familiar with linux at all. Basically what I want it to do is, on login, check to see if there is an existing Screen session (named <pid>.irssi) and if there is, attach to it (screen -x irssi), and if there isn't, launch a screen session and irssi inside of the screen.

The purpose of the script is so that my friend, who is a windows user, can launch a batch file in windows that launches putty, connects to my server and automatically displays an active irssi session. If there isn't one running (after a reboot or something), i want it to launch one now.

Anyone know how I can do this? I tried for an hour last night, but couldn't quite figure out how to do it.

[kary]

No responses yet, so i thought i'd post a little more.

There is a screen command that shows what screens are currently active:

corey@terra ~ $ screen -list
There is a screen on:
7601.irssi (Attached)
1 Socket in /var/run/screen/S-corey.
corey@terra ~ $


So, is there a way to put in a script that if there's nothing matching *irssi in the above list, then to execute a command? This is where i'm lost.

[kary]

Alright, came up with a simple script to do this. For anyone interested:

#!/bin/bash

num=`screen -list | grep irssi | wc -l`

if [ "$num" -eq "0" ]
  then
    echo "No screen+irssi session found"
  else
    echo "Screen+Irssi session found"
fi