Merge pull request #374 from casals/patch-23

Update adding-a-new-ssh-key-to-your-github-account.md

content/github/authenticating-to-github/adding-a-new-ssh-key-to-your-github-account.md

@@ -87,7 +87,7 @@ After adding a new SSH key to your {% data variables.product.product_name %} acc
   $ sudo apt-get install xclip
   # Downloads and installs xclip. If you don't have `apt-get`, you might need to use another installer (like `yum`)
 
-  $ xclip -sel clip < ~/.ssh/id_rsa.pub
+  $ xclip -selection clipboard < ~/.ssh/id_rsa.pub
   # Copies the contents of the id_rsa.pub file to your clipboard
   ```
   {% tip %}