Useful SSH Commands

Generating SSH key

Short read about using ED25519 instead of RSA Medium
To generate a SSH key use:
ssh-keygen -t ed25519 -C "comment"
To add your public key to a server use:
ssh-copy-id user@host

SSH config file

To make it easier to SSH you can set up a config file in the .ssh folder
containing the following.

~/.ssh/config

# global options
User user

# host-specific options
Host myserver
    HostName server-address
    Port     port

With such a configuration, the following commands are equivalent

$ ssh -p port user@server-address
$ ssh myserver

Send a command over SSH:
ssh <user>@192.168.1.1 'ls -l; ps -aux; whoami'

rsync over SSH

rsync -avzh SRC USER@HOST:DEST
rsync -avzh -e "ssh -p $sshport" ~/folder1 $sshuser@$instancehost:~