# File lib/session.rb, line 478
    def get_var name
      stdin.puts "#{ ECHO } \"#{ name }=${#{ name }}\""
      stdin.flush

      var = nil
      while((line = stdout.gets))
        m = %r/#{ name }\s*=\s*(.*)/.match line
        if m
          var = m[1] 
          raise ExecutionError, "could not determine <#{ name }> from <#{ line.inspect }>" unless var
          break
        end
      end

      var
    end