Shell Programming and Scripting

looks like that is working ok, the problem is here:

+ ping 148.202.1.29
148.202.1.29 is alive
+ 0=0
servscript: 0=0: not found
+ echo 148.202.1.29 esta muerto (<-- is dead, in spanish)
148.202.1.29 esta muerto

as you can see the ping works all right, and it does send a 0 as an indication that it all went fine and the host did respond, and echoes host is alive, but then it's that error that says: servscript: 0=0 not found... and it also echoes host is dead, even if it had already checked that it was alive...

im not sure what it is, i guess is some kind of syntax error but i dont know, it looks fine to me...

Try integer comparison ...

Code:

if  test $? -eq 0  then 
  echo " Alive"
fi

Thanks, i already fixed it, seem that teh sintax was:

if ping $ipadr
then
echo "is alive"
else
echo "is dead"
fi

it seems thet the if statement just goes like if 0 do something... i didnt knew that... but thank you all for helping me

only one more thing: when it's pinging it shows the results, 148.202.15.70 is alive, and i dont want that to be shown, it only needs to run and do nothing if the host is alive, if a host doesnt answer send an email...

is it anyway to tell it that i dont need the output on the screen?

Code:

echo "dead " > tmp

ping yahoo.com
if test $? -eq 0 
then
  sleep 0 ;
else
sendmail X@Y.com  < tmp
fi

One more way .....

Code:

echo "dead " > tmp

ping yahoo.com
if test $? -eq 0
then
  stty -echo ;
  echo "Alive" ;
  stty echo ;
else
sendmail X@Y.com  < tmp
fi

Thank you all for Helping me with my script, here it is finished, it's not fancy, it's actually very simple, but for monitoring less than 25 servers is ok.
I'll leave it Here if someone else wants to use it.

there are 2 files, servscript and strike1, servscript will be running in the background all day and pinging the hosts every 5 minutes, if the host is alive then it continues scanning a does nothing, if the host is dead it writes it's IP address to the file deadip, when it finish scanning all of the ip's in the ipaddresslist file, then it will start the striek1 script, whose only function is to wait a minute, just to make sure that the host didnt answered because it was busy, then it pings all of the ip's in the deadip file, if they are still dead it sends an email to the sytems administrator, strike1 finishes and control goes back to servscript where it sleeps for 5 minutes to start the scanning all over again...

$ cat servscript

#!/usr/bin/sh
#Sistema de Monitoreo de Servidores
#CENCAR

a=1
while (test "$a"!="0")
do
for ipaddress in `cat ipaddresslist`
do
if ping $ipaddress >> pingout
then
continue
else
echo $ipaddress >> deadip
fi
done
./strike1
sleep 300
rm deadip
rm pingout
done

$ cat strike1

sleep 60
for a in `cat deadip`
do
if ping $a >> pingout
then
continue
else
echo $a" No Respondio al Segundo Intento" | mailx -s "ADVERTENCIA DEL SISTEMA DE MONITOREO" xxxx@cencar.udg.mx
echo $a" No Respondio al Segundo Intento" | mailx -s "ADVERTENCIA DEL SISTEMA DE MONITOREO" xxxx@cencar.udg.mx
fi
done