RSYNC is a powerful command-line utility used primarily for copying and synchronizing files/directories across systems, which also allows data backup in Linux/Unix systems. When using RSYNC, the `-avz` option is commonly used, and it stands for:
- `-a` or `—archive`: This means archive mode, which is equivalent to using the options `-rlptgoD` all at once. It ensures that symbolic links, devices, attributes, permissions, ownerships, etc., are preserved in the transfer. This option provides a recursive and potentially quicker process, making it a popular choice for backups and mirroring.
- `-v` or `—verbose`: This increases verbosity, making RSYNC show more information about what it’s doing during execution. It’s useful for interactive use or debugging.
- `-z` or `—compress`: This compresses the data during the transfer. This potentially reduces the amount of data sent over the network, providing a possible speed increase on slower networks.
So, when the `-avz` command is used together, it creates a complete mirror of the source directory onto the destination directory, in an efficient and user-friendly manner.
For example, if you want to move from directory1 to directory2, you would use the command `rsync -avz directory1/ directory2`. Here, `directory1/` is referred to as the source and `directory2` as the destination.
This command is beneficial when maintaining a copy of large directories that do not alter regularly. Instead of copying the entire directory, `rsync -avz` allows only the changes or new additions to be transferred, resulting in significant time savings.
Despite its advantages, it’s important to remember that the `-z` option could result in more CPU usage. Hence, it is not beneficial over faster networks where CPU speed could be a limiting factor.
The information was drawn from multiple sources, including:
- RSYSNC man page ([rsync.samba.org](https://download.samba.org/pub/rsync/rsync.html)) – The manual gives a detailed explanation of the commands and options available for RSYNC.
- Explanation on tech websites like The Geek Stuff ([thegeekstuff.com](https://www.thegeekstuff.com/2010/09/rsync-command-examples/)) or TecMint ([tecmint.com](https://www.tecmint.com/rsync-local-remote-file-synchronization-commands/)) – These provide comprehensive guides on understanding and utilizing the RSYNC command effectively.
It is through these resources that the `-avz` option gains its usage and understanding amongst RSYNC users.
