title: How do I broadcast messages to all bash terminal in python using wall command with stdin?
body: <p>I wanted to broadcast message to all the bash terminal on my raspbian.</p>
  
  <p>I understand that there's wall command to perform the step and I could use os.system python module to execute the command. </p>
  
  <p>However, running the command "wall text.txt" requires sudo privilege. Is there any way to use wall command  with stdin from python? </p>