Shell Programming and Scripting

if you have a ssh root access to each machine
then yes
else no
fi

#!/bin/bash
for SERVER in ip1 ip2 ip3 .... # list of ip of servers (can be hostames if recognized)
do
    ssh root@$SERVER apt-get install program1 program2 ...
done

# Assume $remote_server, $my_user_id, $my_password, and $my_command were read in earlier 
  # in the script.
  # Open a ssh session to a remote server, and wait for a username prompt.
  spawn ssh $remote_server
  expect "password:"
  # Send the password, and then wait for a shell prompt.
  send "$my_password\r"
  expect "%"
  # Send the prebuilt command, and then wait for another shell prompt.
  send "$my_command\r" #apt-get install xorg 
  expect "%"
  # Capture the results of the command into a variable. This can be displayed, or written to disk.
  set results $expect_out(buffer)
  # Exit the ssh session, and wait for a special end-of-file character.
  send "exit\r"
  expect eof