generate rsa public key from private key code example

Example 1: create public key from private

chmod 400 ~/.ssh/id_rsa
ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub

Example 2: how to generate my RSA key pair

myLocalHost% ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key(/home/johndoe/.ssh/id_rsa):