client.cr

require "socket"

UNIXSocket.open("/tmp/cr.sock") do |sock|
  puts "What is your name?"
  name = gets
  sock.puts name
  puts sock.gets
  sock.close
end

server.cr

require "socket"

server = UNIXServer.new("/tmp/cr.sock")
while sock = server.accept 
  # proc = ->(sock : UNIXSocket) do
  spawn do
    name = sock.gets
    puts name
    sock.puts "Hello #{name}."
    sock.close
  end
# end
# proc.call(sock)
end