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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.

Using a BASH Script

after-change.sh

#!/bin/bash
#
# Monitor the input directory and if any change occurs run the provided command:
#
# Usage:
#   after-change.sh /tmp ls -al %f
 
if [ $# -lt 3 ]; then
  echo "Usage: $0 dir cmd "
  exit 1
fi
 
which inotifywait 2>&1 >/dev/null
 
if [ "$?" == "1" ]; then
  echo "ERROR:  inotifywait not installed."
  exit 1
fi
 
dir=$1
shift
cmd=$1
shift
files=$*
 
inotifywait -q -r -m $dir
eval $cmd