rsync

Simple definition

An effective copying and file synchronization tool.

Technical definition

rsync compares data and transfers only what is necessary, locally or via SSH.

What is it used for ?

Synchronize directories or perform some backups.

Practical example

rsync -av /data/ server:/backup/ can synchronize a folder to a remote server.

Common issues

• Option –delete used without precaution
• Unpreserved permissions
• Source path with final slash misunderstood

Related terms

SSH

Key takeaway: Exact behavior and commands may vary depending on versions, products and architectures.