Interactive SSH Example w/ multiple channels

ssh_example.rb

$VERBOSE=nil
require 'rubygems'
require 'net/ssh'
require 'logger'
logger=Logger.new(STDOUT)

Net::SSH.start('localhost', `whoami`.chomp, password: "<YOUR PASSWORD>") do |ssh|
  ssh.open_channel do |channel| # open the SSH channel
    channel.exec "psql -U SOME_USER -W" do |ch, success| # execute the remote command
      channel.on_request("exit-status") do |ch, data| # handle the return code
        rc = data.read_long.to_i
        puts "Got return code: #{rc}"

        ssh.open_channel do |c|
          c.exec 'pwd' do |ch|
            c.on_data do |ch, data|
              puts "PWD: #{data}"
            end
          end
        end

      end
      channel.on_data do |ch, data| # handle STDOUT output
        puts "OUT: #{data}"
        logger.debug(data)
      end
      channel.on_extended_data do |ch, type, data| # handle STDERR output
        puts "ERR: #{data}"
        channel.send_data "INVALID PASSWORD\n"
      end
    end
    ssh.loop # wait for the SSH channel to close
  end
end