shell programming problem

ratul_11 · 12-15-2005, 11:32 PM

Hi guys
This is Anirban here. I have the problem again with the previous shell script.Which was
Write a shell script that will check whether a server is up or not(on ping) & log the report to a file.

I have tried to write the program in the following way

#! /bin/sh
echo -n "Enter the IP or Hostname of the Server"
read host
#echo $host
ping -c2 $host &>file2
if [ $? = 0 ];then
echo "Server is up and working" $host
else
echo"Server is not up and not working" $host
fi

But when I am trying to execute the program in the case when the server is not up it is showing
The server is up and running but from the ping statistics it is showing that 100% loss is occured.I am not able to point the problem.(i used the chmod 755 filename before executing the program)

Please help me.And one more thing is there any other option to check the connectivity without ping command?

bulliver · 12-16-2005, 02:46 AM

Code:

if [ $? = 0 ];

"=" is for comparing strings. Try:

Code:

if [ $? -eq 0 ];

cyberjun · 12-16-2005, 02:47 AM

Hi,
try this:

Code:

#!/bin/bash

echo -n "Enter the IP or Hostname of the Server: "
read host
echo $host
ping -c2 $host > /dev/null 2> /dev/null
if [ $? = 0 ];then
echo "Server is up and working" $host
else
echo "Server is not up and not working" $host
fi

bigearsbilly · 12-19-2005, 10:03 AM

I just use:

Code:

        if ! ping $host
        then
            ERROR failed on $host $nickname
        fi

I think using ping is quite a crude method. There are probably much better
ways to do it.

chrism01 · 12-19-2005, 07:44 PM

ping will tell you whether the TCP/IP stack is working ie basic network cxn is up. Unfortunately, that's all it tells you .... also be aware that some people disable ICMP request/response to try and avoid probs with ping flood attacks.

denver1980 · 12-20-2005, 03:47 AM

Best way is tu use nmap ...

Code:

nmap -FP0 192.168.0.100 | tail -1

bigearsbilly · 12-20-2005, 07:29 AM

I've got a script you can have if you want?
Wrote it years ago, it does the job good enough.