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Top Forums Shell Programming and Scripting Shell script to ping multiple servers Post 302993930 by fretagi on Thursday 16th of March 2017 08:46:53 AM
Old 03-16-2017
Shell script to ping multiple servers

Hi

I did the following script to ping multiple servers, but I keep on receiveing duplicate emails for one server that is down:
Code:
#!/bin/bash

date
cat /var/tmp/servers.list |  while read output
do
    ping -c 1 "$output" > /dev/null
    if [ $? -eq 0 ]; then
    echo "node $output is up"
    else
    echo "node $output is down" | mailx -s "$output not pinging" xyz@klm.com
    fi
done

So the first email I received had body as "node is down" and subject "not pinging"
and second email I received had body as "node 192.168.5.50 is down" and subject "192.168.5.50 not pinging".
So I have 13 ips on the servers.list, so the only server down is 192.168.6.50
 

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unbound-streamtcp(1)						      unbound						      unbound-streamtcp(1)

NAME
unbound-streamtcp - unbound DNS lookup utility SYNOPSIS
unbound-streamtcp [-unsh] [-f ipaddr[@port]] name type class DESCRIPTION
unbound-streamtcp sends a DNS Query of the given type and class for the given name to the DNS server over TCP and displays the response. If the server to query is not given using the -f option then localhost (127.0.0.1) is used. More queries can be given on one commandline, they are resolved in sequence. The available options are: name This name is resolved (looked up in the DNS). type Specify the type of data to lookup. class Specify the class to lookup for. -u Use UDP instead of TCP. No retries are attempted. -n Do not wait for the answer. -s Use SSL. -h Print program usage. -f ipaddr[@port] Specify the server to send the queries to. If not specified localhost (127.0.0.1) is used. EXAMPLES
Some examples of use. $ unbound-streamtcp www.example.com A IN $ unbound-streamtcp -f 192.168.1.1 www.example.com SOA IN $ unbound-streamtcp -f 192.168.1.1@1234 153.1.168.192.in-addr.arpa. PTR IN EXIT CODE
The unbound-streamtcp program exits with status code 1 on error, 0 on no error. AUTHOR
This manual page was written by Tomas Hozza <thozza@redhat.com>. NLnet Labs Mar 21, 2013 unbound-streamtcp(1)
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