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SSH

	apt-get install openssh-server			---	Server Side
	apt-get install openssh-client				---	Cleint Side
	service ssh start 						--	Server side

	ssh username@host.com				---	Cleint side		
	ssh username@127.0.0.1				---	Client side

Disabling root login on ssh

$nano /etc/ssh/sshd_config
>Search "PermitRootLogin yes"
>Change "PermitRootLogin No"
$service ssh restart

Note: So now if anyone want to login as root he has to login as user account first then use su command to login to user account if he is added to sudoers file

How to Connec to amazon intance via ssh

Download the key 
chmod 400 key.pem
ssh -i root@public-ip.com

Transfering files between systems

$sftp -i key.pem ubuntu@public-ip.com
$ls 				--> list files on remote host
$lls 				--> list files on local host
$put local_file.txt	 --> Upload my local_file on remote server
$get remote_file.txt	 --> Download remote_file.txt to local machine