SSH key

$ cd ~/.ssh
$ ls

$ mkdir key_backup
$ cp id_rsa* key_backup
$ rm id_rsa*
$ ssh-keygen -t rsa -C "your_email@youremail.com"

On the GitHub site Click “Account Settings” > Click “SSH Public Keys” > Click “Add another public key”

Open the id_rsa.pub file with a text editor (Notepad, TextEdit, or gedit will do just fine). This is your public SSH key. You may need turn on “view hidden files” to find it because the .ssh directory is hidden. It’s important you copy your SSH key exactly as it is written without adding any newlines or whitespace. Now paste it into the “Key” field.

mate id_rsa.pub

paste it