first iteration of rake task definition

Rakefile

files = [ 
  :a_file => "/path/to/a_file", 
  :b_file => "/path/to/b_file", 
  :c_file => "/path/to/c_file" 
]

desc "Process files"
task :process_files do
  files.each |file_name, file_location|
    process_file(file_name, file_location)
  end
end