ruby-listen 2.4.0-4 (amd64 binary) in ubuntu wily

 This Ruby library listens to file modifications and notifies you about the
 changes.
 .
 It detects file modification, addition and removal, and supports multiple
 directories from a single listener. It uses checksum comparison for
 modifications made under the same second, and allows supplying regexp-patterns
 to ignore and filter paths for better results.