Quick and Dirty delta between 2 csv files

csvdiff.rb

#!/usr/bin/env ruby
#
# A 30 second hack job to compare two CSV files
#
file1 = ARGV[0] ? ARGV[0] : false
file2 = ARGV[1] ? ARGV[1] : false
file1_set = []
file2_set = []
delta = []

if !file1 or !file2
  puts 'File arguments required' 
  exit 0
end

def check_file(file, file_arg)
  if !File.exists? file
    puts "File argument #{file_arg} is not a valid file" 
    exit 0
  end
end

check_file(file1,1)
check_file(file2,2)

f = File.open(file1,'r').read
f.each_line do |line|
  file1_set.push line.strip
end

f = File.open(file2,'r').read
f.each_line do |line|
  file2_set.push line.strip
end

file2_set.each do |f2|
  delta.push(f2) if !file1_set.include?(f2) 
end

delta.each do |row|
  puts row
end