Rsync
Internal
Overview
rsync is a differential, recursive file transfer utility. rsync copies files to or from a remote host, or locally on the current host. For remote transfers, rsync must be installed on both the source and destination machines. rsync does not support copying files between two remote hosts.
rsync may connect to the remote system either using a remote-shell programs, such as ssh or ssh, or directly to the rsync daemon running on the remote system, via TCP. The remote-shell transport is used whenever there is a ":" after the host specification. If not configured otherwise with RSYNC_RSH environment variable or with -e command line option, rsync uses ssh by default. The rsync daemon transport is used when there is a "::" separator after host specification, or when "rsync://" is explicitly specified. If neither the source or destination path specify a remote host, the copy occurs locally.
rsync -avz remoteuser@remotehost:src/bar /data/tmp
Organizatorium
If a single source argument is specified without a destination, the files are listed in an output format similar to "ls -l".