How to automate ssh

Please find below the script and run form client machine from where you want to set login without password.

#!/bin/bash
#withoutPasswordLogin.sh
#Author       : Mahendra Pratap Singh
#Created on   : Dec 18, 2013
#Modified on  : Dec 18, 2013
#Version      : 1.1

#Description  : This script is to automate login on linux machine without password, Script says one time password only.

# Usage: sh withoutPasswordLogin.sh

secureKeyGeneration()
{
	
if [[ ! -f $HOME/.ssh/id_dsa ]] &&  [[ ! -f $HOME/.ssh/id_dsa.pub ]]
then
	mkdir –p $HOME/.ssh
	chmod 0700 $HOME/.ssh
	ssh-keygen -t dsa -f .ssh/id_dsa -P ''
else
	echo " Secure Key Already Generated"
fi
}

#creating temp script

secureKeyScript()
{
	touch $HOME/.ssh/id_dsaSecureKey.sh
	echo '#!/bin/bash' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'echo ""' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'mkdir –p $HOME/.ssh' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'chmod 0700 $HOME/.ssh' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'touch $HOME/.ssh/authorized_keys2' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'touch $HOME/.ssh/authorized_keys' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'cat $HOME/id_dsa.pub >> $HOME/.ssh/authorized_keys2' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'chmod 0600 $HOME/.ssh/authorized_keys2' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'ln –s $HOME/.ssh/authorized_keys2 $HOME/.ssh/authorized_keys' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'cd $HOME' >> $HOME/.ssh/id_dsaSecureKey.sh
	echo 'rm -f id_dsa*' >> $HOME/.ssh/id_dsaSecureKey.sh
	chmod 777 $HOME/.ssh/id_dsaSecureKey.sh
}
	
scriptAgrgument()
{
	echo "Please enter remote machine IP Address"
	read ipInput
	echo ""
	echo "Please enter remote machine Username"
	read usernameInput
	scp $HOME/.ssh/id_dsa* $usernameInput@$ipInput:/$HOME
	echo ""
	echo "Please re-enter remote machine Password"
	echo ""
	ssh $usernameInput@$ipInput $HOME/id_dsaSecureKey.sh
	echo "cleaning up"
	rm -f $HOME/.ssh/id_dsaSecureKey.sh
}

main()
{
	secureKeyGeneration
	secureKeyScript
	scriptAgrgument
}

main

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