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Help with script, shutdown if no ping responce


 
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# 15  
I suggest you test crontab under a normal user account to get a feel for it.
# 16  
Ok thanks, il do that now, in the script you provided do i replace cable-ip with the ip of my modem?
# 17  
Quote:
Originally Posted by ringofsteel
Ok thanks, il do that now, in the script you provided do i replace cable-ip with the ip of my modem?

Yes, I do encourage you to understand the script line by line. Of course you may have the IP address in /etc/hosts to assist, rather than coding into the script. So if the address changes you only have to change it in one place.
# 18  
To test the script i just put the ip address straight in.

I have defined the script in the cron file to run every min as root in vmware.

If i pull the wire on the modem and leave for 5 mins the machine will still be on fine.
# 19  
I cant get this to work. Could you rewrite it quickly for me so it is ready to be installed as cron pinging 192.168.100.1?

Last edited by ringofsteel; 01-07-2008 at 02:05 PM..
# 20  
Code:
#!/bin/sh

DOSHUTDOWN=/usr/bin/true

for d in a b c
do
    if /usr/sbin/ping cable-ip
    then
         DOSHUTDOWN=/usr/bin/false
         break
    fi
done

if $DOSHUTDOWN
then
   shutdown -g 1 -y -i 5
fi

I suggest you just save this script, make it executable then test it as root *before* installing it as a cronjob.

Also, I suggest you add some kind of test at the start to only enable the shutdown after a completely successful bootup, otherwise you may get in the situation where as soon as you start the box up, it starts cron, and finds it has no path to the modem and shuts down before getting the network started.
# 21  
Quote:
Originally Posted by porter
Also, I suggest you add some kind of test at the start to only enable the shutdown after a completely successful bootup, otherwise you may get in the situation where as soon as you start the box up, it starts cron, and finds it has no path to the modem and shuts down before getting the network started.
Thanks, il try the code as it is as root first. Il post the result hang on.

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