runcmd.rb

#!/usr/bin/env ruby 
require 'rubygems'
require 'pmap' 
require 'net/ssh'

# Ghetto script to run a command on hosts provided in a file
# this script will spawn parallel threads to run commands expediently
# to use: ./runcmd.rb hosts.txt user pass "command"

filename = ARGV.shift || raise("no filename provided")
user = ARGV.shift || raise("no user provided")
pass = ARGV.shift || raise("no password provided")
command = ARGV.shift || raise("no command given")

File.open(filename).pmap do |i|
  host = i.chomp
  begin	
    Net::SSH.start(host, user, :password => pass, :timeout => 7, :number_of_password_prompts => 0) do|ssh|
      result = ssh.exec!(command)
      puts "#{host}: #{result}"
    end
  rescue Timeout::Error
    puts "#{host}: !!! Timed out"
  rescue Errno::EHOSTUNREACH
    puts "#{host}: !!! Host unreachable"
  rescue Errno::ECONNREFUSED
    puts "#{host}: !!! Connection refused"
  rescue Net::SSH::AuthenticationFailed
    puts "#{host}: !!! Authentication failure"
  rescue Net::SSH::Disconnect
    puts "#{host}: !!! Connection closed by remote host"
  end
end