rsync is a utility for efficiently transferring and synchronizing files across computer systems.
It uses a delta-transfer algorithm which sends only the differences between the source files and the existing files in the destination.
Examples
Syncing a local directory to a remote machine. Please note that there is no slash ‘/’ after ‘my-app’ in the command below.
rsync -ar my-app username@some_host:/home/username/
The ‘-a’ parameter stands for archive mode, while the ‘-r’ parameter represents recursive mode, meaning it synchronizes all files within the directory recursively.