文件夹内，数字文件重命名

pname.rb

#!/bin/ruby
# annidy 2014-6-11

d = Dir.new(".")
max = 0
d.each {|x|
	m = /^\d+\./.match(x)
	m = m or ["0"]
	max = [max, m.to_s.to_i].max
}

mx = max.to_s.length
print("Max = ", max)
puts
d.each {|x|
	m = /^\d+\./.match(x)
	if m
		l = mx - m.to_s.length + 1
		if l > 0
			File.rename(x, "0" * l + x)
		end
	end
}