Need help in Shell Scripting Post: 302956434

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Top Forums Shell Programming and Scripting Need help in Shell Scripting Post 302956434 by shekar777 on Wednesday 30th of September 2015 12:17:47 AM

09-30-2015

Registered User

Need help in Shell Scripting

Hello,

I need some help in Shell scripting which needs to change Host names on /etc/sysconfig/network file on remote hosts.

Here is the script I've written.

Code:

#!/bin/bash
# Make sure you have the correct hostname set on Servers, If you have the incorrect hostname it will get updated in conf"
hostsfile=/home/userid/hostname/servers.txt

if [[ ! -r $hostsfile ]]; then
    echo "ERROR: Cannot read hostsfile $hostsfile"
    exit 2
fi

SSH_OPTS="-q -i /home/userid/userid.pem -o PasswordAuthentication=no -o BatchMode=yes -o StrictHostKeyChecking=no -o ConnectTimeout=3"

for destination in `cat $hostsfile`; do
shortname=`echo $destination | sed 's/.sys.domain.com//g'`
echo $shortname
export shortname
ssh -tt -i $SSH_OPTS xxx@$destination '
echo "INFO: Updating /etc/sysconfig/network"
sudo perl -pi -e "s/^HOSTNAME=\"\"/HOSTNAME=\"$shortname\"/g" /etc/sysconfig/network
sudo hostname $shortname
'
done

*Where servers.txt contains FQDN of hosts.

When I try to execute this it's not exporting shortname to remote host? is there any way that shortname can export to remote host?

And also I need to add entry of IP address and Short Hostname (Not FQDN) and localhost entry in /etc/hosts file
it should looks as below.

xx.xx.xx.xx hostname localhost

Can you guys help on this, i need to execute this on at least 50 hosts.

shekar777

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sxsaaas

LEARN ABOUT DEBIAN

dnsspoof

DNSSPOOF(8)						      System Manager's Manual						       DNSSPOOF(8)

NAME

       dnsspoof - forge replies to DNS address / pointer queries

SYNOPSIS

       dnsspoof [-i interface] [-f hostsfile] [expression]

DESCRIPTION

       dnsspoof  forges replies to arbitrary DNS address / pointer queries on the LAN. This is useful in bypassing hostname-based access controls,
       or in implementing a variety of man-in-the-middle attacks.

OPTIONS

       -i interface
	      Specify the interface to use.

       -f hostsfile
	      Specify the pathname of a file in hosts(5) format. Only one hostname allowed per line (no aliases), although hostnames  may  contain
	      wildcards (such as *.doubleclick.net).

       expression
	      Specify a tcpdump(8) filter expression to select traffic to sniff.

       If no hostsfile is specified, replies will be forged for all address queries on the LAN with an answer of the local machine's IP address.

FILES

       /usr/share/dsniff/dnsspoof.hosts
	      Sample hosts file.

SEE ALSO

       dsniff(8), hosts(5)

AUTHOR

       Dug Song <dugsong@monkey.org>

																       DNSSPOOF(8)