This works on both linux and MacOS

Basic ssh commands converted to ssh/config file format

Simplest format

Run with: "ssh blog" => (equivalent to: "ssh ubuntu@example.com" and "ssh -i ~/.ssh/id_rsa -p 22 ubuntu@example.com")

Host blog User ubuntu HostName example.com

Setting more options

Run with: "ssh secure_blog" => (equivalent to: "ssh -p 12345 -i ~/.ssh/identity_file_that_is_not-id_rsa ubuntu@example.com")

Host secure_blog User ubuntu HostName example.com Port 12345 IdentityFile ~/.ssh/identity_file_that_is_not-id_rsa