UNIX for Dummies Questions & Answers

Hi there

i am busy compiling a script to ping a remote server, when the server is alive i get it to send me an sms, however i cant seem to make the ping stop, can somebody please help? please?

Code:

while (9)
    set ans="`ping $IPaddress 1`"
    if ( "$ans" == "IPaddress is alive" ) continue             
    sleep 5
    echo "is alive"
end  
echo out of loopp. my script that i have created is below.

Kind regards...

brian

Code:

ping -n 3 -i IP_ADDRESS

Check in:

Code:

man ping

thank you, but this needs to continually ping until the server is up. then once it comes up (say 3am), i dont really want it to continually sms me every 5 seconds till i get to work. i just need to know that the network connection has been reastablished and for the script to them stop running? kind regards

add the ping in loop

Code:

i=2
while [ $i -eq 2 ];do

ping -c 2 172.21.142.108
 if [[ $? == 0 ]]

then
echo "server up"
i=0
else
echo "server down"
fi
done

You can schedule it in crontab so that the script runs every minute or so. Do a

Code:

man crontab

to see how it works.

As far as the 'not sending sms with error continually' you can have your script write a log every time the server is checked.
Then just before pinging, the script should read the last line of the log

Code:

cat log | tail -1

This is the first thing that come into my mind. Maybe someone has a better idea.
If you do something like this, do not forget to clear the log every so often!!

thanks guys, it works