Generate SSH config

gen_ssh_config

#!/bin/ruby

def add_host(host, options = {})
  puts "Host #{host}"
  options.each do |k, v|
    puts "#{k} #{v}"
  end
  puts
end

add_host 'git', hostname: 'git.example.com', user: 'git'
add_host 'web', hostname: 'web.example.com', port: 11111, user: 'admin'

Init as

mkfifo ~/.ssh/config

and use as in .bashrc

while true; do ~/bin/gen_ssh_config >~/.ssh/config; done &