Secure Shell (SSH) is a protocol for securely accessing a remote computer. SSH is a package consisting of three utilities – slogin, ssh, and scp. SSH sends commands which are encrypted and thus secure.Once connected client server connection is authenticated using digital certificate and encrypted password.
Syntax
ssh remote_host
where remote_host is host name or host ip address
Example
ssh 10.17.2.45 ssh mylinux.com
This command will work only if remote username is same as local username. Once connected remote system will authenticate user by asking for password.
In case username for remote system is different use below command
Syntax
ssh user_name@remote_host
When logging in for first time you will get message “host key not found”. Simply type yes to continue further. The host key will be stored locally, in .ssh/hostkey folder of your home folder. Next time when you login it will only ask for login password as hostkey is already stored.
Copy files over ssh using scp
ssh can be used to copy files local system to remote server as well as from remote server to local system.
Copy files from remote server to localhost
scp username@Remote_Host_server:/Path/To/Remote/Directory /local_path/
Copy files from local host to remote server
scp file_name username@Remote_Host_server:/Path/To/Remote/Directory
