Problem renaming files

Hi Everyone,

Im new to ruby and am having a hard time with something Im working on.

I want to write a script that takes file names as arguments, then uses
gets to get two values, and then renames the files based on those
values.

example:

I want to rename mulitple files, removing the build number, and
replacing it with another number.

engine.105   -> rename to engine.8

Anyways, so right now Im just working on doing this with one file at a
time. I realize this could be done without a script, but I want to end
up doing this with multiple files at once. My script is probably not the
most efficient way either, but I'd just like to know what Im doing wrong
with how Im doing it. Just so I can learn..

Below is the code.. I run the file as:

ruby c.rb engine.105

I then enter the build number which is 105
Next I enter the version number I want to replace the build number with
which is 5

The following is what I get:

c.rb:14:in `rename': No such file or directory - engine.5 or 5
(Errno::ENOENT)
  from c.rb:14


=====================

#!/usr/bin/env ruby

# Filename arguments
file_names = ARGV.dup.to_s

# Have user input build number to be removed
puts "Please enter the build number you wish to be removed from the
file"
build_number = STDIN.gets.chomp.to_s

# Have user input version number to be appended to file name
puts "Please enter the version number you wish to be appended"
version_number = STDIN.gets.chomp.to_s

# Rename file replacing build number with version number
File.rename(file_names, file_names[build_number]= version_number)

puts "done!"

Attachments:
http://www.ruby-forum.com/attachment/4719/c.rb

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