While Chrome OS keeps things beautifully simple, it does have a crosh shell which gives the user some powerful features. One of these features is SSH which allows you to exchange data between another computer and your Chromebook, giving you secure access to other computers on your network.
For example, lets say you are working on your Chromebook and you decide you want to upload some pictures into Picasa, but they are in your other computer. All you need to do is use ssh to access those pics, transfer them to your Chromebook via SFTP or SCP protocols. Once they are transferred, you can upload them into Picasa. And you didn’t even need to get up from your comfy chair and you saved some wear and tear on your sneakers.
Step 1: Access the Chromebook terminal.
Ctrl + Alt + T
Step 2: Access the SSH sub-shell.
Type “ssh” in the command line
Step 3: Log into your the target host.
You will have to know the host IP to do this. If you don’t know the IP of the host you are trying to access use “ipconfig” in the host system and keep a record of it for future reference. (I’m assuming the computer you are trying to access is in fact yours and is easily assessable.) The basic form of a ssh login is “ssh  (port is usually port :22)” In crosh, this is entered by the following:
Type “host” and the ip address you want to connect to, then press “enter”.
Type “user” and type the user login name, then press “enter.”
Type “ls”, and you’ll be able to see all the files in the user home directory and browse the host file system with a range of terminal commands.
Step 4: Log out of the host system.
To quit the session, type “quit” and you’re done. Type “exit” to quite the crosh shell.
So there you have it. SSH is a pretty simple and handy tool to know, and Chrome OS gives you access to it.