# How to ssh to a remote server without typing your password
# ==========================================================

#       Create this folder if it does not exist: ~/.ssh
mkdir ~/.ssh

#       Set the correct permissions (required)
chmod 700 ~/.ssh

#       Generate an RSA key pair for identification with the remote server
ssh-keygen -t rsa

#       Copy your public key to the remote server
cat ~/.ssh/id_rsa.pub | ssh myserver.com 'cat >> ~/.ssh/authorized_keys'

#       ssh is very strict about correct permissions
ssh myserver.com 'chmod g-w,o-w ~; chmod 700 ~/.ssh; chmod 600 ~/.ssh/authorized_keys'

#       Now you can connect to the remote server without typing your password
ssh myserver.com

#       Create an alias for your server's address
#       (Use the alias with rsync, scp, ssh, etc.)
alias=jupiter
user=carl
host=myserver.com

cat >> ~/.ssh/config <<END
Host $alias
    User $username
    HostName $host
END

#       Now these two commands are equivalent
ssh myserver.com
ssh jupiter

#       In one command:
#       ssh to a the login server and then the work server
cat >> ~/.ssh/config <<END
Host jupiter
    User carl
    Hostname myserver.com

Host saturn
    User carl
    ProxyCommand ssh -q -W %h:%p jupiter
END

#       Now you can connect directly to the work server from your laptop
ssh saturn