How to remove and create SSH key

create SSH key

1. first step : check the local ssh cd ~/.ssh if there is a ssh key already exist, you will find files like: id_rsa.pub , known_hosts , id_rsa and so forth.
2. second step: create a new ssh key: ssh-keygen -t rsa -b 4096 -C "XXX@example.com" if you already have a ssh key it will prompt Enter file in which to save the key (/Users/lynnyang/.ssh/id_rsa) just input y(yes). In case you will forget the password, do not enter any password there.
3. copy the ssh key and add it in the github page of “SSH and GPG keys” cat cat id_rsa.pub then copy all the character into “SSH and GPG keys”;
4. Done.