Linux has powerful tools that enables you to sync files or folders from one source directory to another destination directory.

1. Install inotify tools

sudo apt-get install inotify-tools
More information can be found on their wiki: https://github.com/rvoicilas/inotify-tools/wiki

2. Install rsync

sudo apt-get install ssh rsync

3. Create a new bash script file called sync.sh

nano sync.sh

4. Paste the below code in the sync.sh file

#!/bin/sh
while inotifywait -r -e modify,create,delete,move /home/amrit/rsync-test/source_folder; do
rsync -avz /home/amrit/rsync-test/source_folder /home/amrit/rsync-test/destination_folder --delete
done
You must modify the highlighted source and destination folder locations in the above shell script file to match your setup.

5. Make the shell script executable

chmod +x sync.sh

6. Run the shell script

./sync.sh
That’s it, you are done! At this point if you make any change to the source directory, it will also apply to the destination directory.