Encoding converter

ToEuc.rb

#!/usr/bin/env ruby

IO.popen("nkf -g *","r+"){|io|
  while (l = io.gets) != nil
    if /(^.*):Shift_JIS$/ =~ l then
      tmp = $1
      if /(.*)\.Shift_JIS$/ =~ $1 then
        next
      end
      print "S: #{tmp}\n"
      system ("cp #{tmp} #{tmp}.Shift_JIS")
      system ("nkf -e --overwrite #{tmp}")
    elsif /(^.*):ISO-2022-JP$/ =~ l then
      tmp = $1
      if /(.*)\.ISO-2022-JP$/ =~ $1 then
        next
      end
      print "I: #{tmp}\n"
      system ("cp #{tmp} #{tmp}.ISO-2022-JP")
      system ("nkf -e --overwrite #{tmp}")
    end
  end
}