Simple ruby script: find string in multiple files and replace.

findrepl.rb

#!/usr/bin/env ruby
#
# First: Filename (*.html, *.rb, *.py and etc)
# Second: Find
# Third: Replacement
$pwd = Dir.pwd
$args = []
ARGV.each { |arg| $args.push(arg) }

if $args.size < 3
  puts "Need three arguments."
  exit
end

files = Dir.glob File.join($pwd, "**/", $args[0])
find = Regexp.new $args[1]
repl = $args[2]
files.each do |file|
  str = ""
  open(file) { |fp| str = fp.read  }
  if str.include?($args[1])
    print "Found '#{file.sub($pwd, "")}'\n"
    
    open(file, "w") do |fp|
      fp.write str.gsub(find, repl)
      print " - Replace complete\n"
    end
  end
end