add my first line

add_my_first_line.rb

my_first_line = "#!/home/seungjin/opt/python-2.6.6/bin/python\n"

ARGV.each do |file|

	#file exist?
	if ! File.exist?(file)
	  puts "File #{file} does not exist"
	  exit
	end

	File.open(file,'r+') { |f|
	  lines = f.readlines
	  f.pos = 0
          f.print my_first_line
          f.print lines
          f.truncate(f.pos)
	}
end