watch directory

ps_aux_pipe_grep_wathcer

Marcos-MacBook-Pro:~ marcocrepaldi$ ps aux
USER             PID  %CPU %MEM      VSZ    RSS   TT  STAT STARTED      TIME COMMAND
marcocrepaldi  25226   0.0  2.7  2557336 114636 s004  S+    3:11PM   0:14.09 ruby path/to/rake watcher:start

watcher.rake

require 'guard'
namespace :watcher do 

  desc "starts watching catalogues directory"
  task :start => :environment do 
    listener = Guard::Listener.select_and_init('/Users/marcocrepaldi/catalogues')
    listener.on_change do |files|
      puts files
    end
    listener.start
  end

end