gistfile1.txt

require "rubygems"
require "net/ssh"

module Kernel
  def with_rsh(host,username,options = {},&block)
    a = RemoteShell.new(host,username,options)
    a.start(&block)
  end
end

class RemoteShell
  attr_accessor :host,:username
  attr_accessor :session,:commands,:options
  def initialize host,username,options = {}
    @host = host
    @username = username
    @options = options
    @commands = []
  end

  def start &block
    Net::SSH.start(host,username,options) do |ssh|
      @session = ssh
      instance_eval(&block)
    end
  end

  def rcd new_dir,&block
    old_dir = rexec("pwd")
    puts "Old directory was : #{old_dir}"
    rexec("cd #{new_dir}")
    new_dir = rexec("pwd")
    puts "New direcrory is : #{new_dir}"
    instance_eval(&block)
    rexec("cd #{old_dir}")
    t = rexec("pwd")
    puts "Back to old direcrory : #{t}"
  end

  def rexec cmd
    foo = @session.exec!(cmd)
    foo
  end
end