Ruby script that can split a file into multiple smaller files

fileSplit.rb

if ARGV.size != 2
  puts "Usage: ruby fileSplit.rb <filename.ext> <size_of_pieces_in_bytes>"
	puts "Example: ruby fileSplit.rb myfile.txt 10"
	exit
end

filename = ARGV[0]
size_of_split = ARGV[1]

if File.exists?(filename)
	file = file.open(filename, "r")
	size = size_of_split.to_i

	puts "The file is #{File.size(filename)} bytes."

	temp = File.size(filename).divmod(size)
	pieces = temp[0]
	extra = temp[1]

	puts "\nSplitting the file into #{pieces} (#{size} byte) pieces and 1 
	(#{extra} byte) piece"

	pieces.times do |n|
		f = File.open("#{filename}.rsplit#{n}", "w")
		f.puts file.read(size)
	end

	e = File.open("#{filename}.rsplit#{pieces}", "w")
	e.puts file.read(extra)
else
	puts "\n\nFile does NOT exist, please check filename."
end