permission.rb

require 'net/ssh'
# get arguments from command line
# decide what to do with them
# and verify they are legit commands

hostname = ARGV[0]
lock = ARGV[1]
user = ARGV[2]

case lock
  when "lock"
     cmd = "sudo chsh -s /usr/bin/false #{user}"
     locker(hostname, cmd)
  when "unlock"
     cmd = "sudo chsh -s /bin/bash #{user}"
     locker(hostname, cmd)
 else quit
 end

def locker(host, cmd)
  begin
    ssh = Net::SSH.start(host)
    res = ssh.exec!(cmd)
    ssh.close
    puts res
  rescue
    puts "Unable to connect to #{@hostname}!"
  end
end