Synchronize files in a directory between 2 hosts using the program rsync.

rsync -av --delete --rsh="ssh -c arcfour -l root" host1.domain.lan:/disk01/ /disk01/

• -a: The files are transferred in “archive” mode, which ensures that symbolic links, devices, attributes, permissions, ownerships, etc. are preserved in the transfer.
• -v: Increase verbosity.
• –delete: The destination is always made to look like the source even if files need to be deleted in the destination. The source's data is never touched.
• This uses ssh as the remote-shell program as the transport.
• -c arcfour: Turns on the lowest grade encryption to speed up the transfer.
• -l root: Specifies the user to log in as on the remote machine.
• The source is always named first
  • host1's /disk01 (source) is the remote host
• The destination is always named second.
  • /disk01 (destination) is a local directory.
• Trailing / on the source means copy the contents of this directory to the destination. Without the trailing / the source gets the directory name copied with all it's files in it.