title: Executing string sent from one terminal in another in Linux pseudo-terminal
body: <p>Lets say I have one terminal where the output of "tty" is "/dev/pts/2"
  From another terminal, I want to send a command to the first terminal and execute it.
  Using:
  echo "ls" > "/dev/pts/2" only prints "ls" in the first terminal
  Is there a way to execute the string?</p>