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Directory - Run a Command Upon Files or Directories Changes

Use either inotifywait or iwatch.

For example

inotifywait -m -e modify,create -r /yourpath && \
chmod 644 file; && \
chown blah:blah file;

NOTE:

-m, –monitor: Instead of exiting after receiving a single event, execute indefinitely. The default behavior is to exit after the first event occurs.
-r, –recursive: Watch all sub-directories of any directories passed as arguments. Watches will be set up recursively to an unlimited depth.
- Symbolic links are not traversed. Newly created sub-directories will also be watched.