def suspend
      _suspend(false) do
        system("tput cup 26 0")
        system("tput ed")
        system("echo Enter C-d to return to application")
        system (ENV['PS1']='\s-\v\$ ') if ENV['SHELL']== '/bin/bash'
        system(ENV['SHELL']);
      end
    end
def suspend
      _suspend(false) do
        system("tput cup 26 0")
        system("tput ed")
        system("echo Enter C-d to return to application")
        system (ENV['PS1']='\s-\v\$ ') if ENV['SHELL']== '/bin/bash'
        system(ENV['SHELL']);
      end
    end
suspends current program and puts user on unix prompt