mass rename

rmultirename

#!/usr/bin/env ruby

def show_usage
  puts "Usage: #{$0} [PATTERN] [REPLACEMENT]"
  puts "Example: #{$0} htm html"
  exit
end

pattern = ARGV[0] || show_usage
replace = ARGV[1] || show_usage

show_usage if pattern == "--help"

`ls -1`.split("\n").each do |filename|
  new_filename = filename.gsub(pattern,replace)
  system("mv #{filename} #{new_filename}") if new_filename != filename
end