Persistent Interactive SSH connection to multiple servers

persistent_ssh.sh

#!/bin/bash
set -e
###############################################
### Add this to your ~/.ssh/config            #
### ControlPath ~/.ssh/master-%r@%h:%p        #
### ControlMaster no                          #
### Run this as ./persistent_ssh.sh box1 box2 #
###############################################

MY_PROMPT="$ "
for arg in "$@"
do
  eval "ssh -MNf $arg"
done
while :
do
  echo -n "$MY_PROMPT"
  read line
  for server in "$@"
  do
    echo "------------------------"
    echo "$server : "
    echo "------------------------"
    eval "ssh $server \"$line\""
  done
done