In the past, in remote-to-remote secure copy, the SCP client opens an SSH connection to the source host and requests that it, in turn, open an SCP connection to the destination. These flags are used internally and are not documented outside the SCP source code. sink mode, which accepts the files sent by the client and writes them (usually to disk) on the remote host.įor most SCP clients, source mode is generally triggered with the -f flag (from), while sink mode is triggered with -t (to).source mode, which reads files (usually from disk) and sends them back to the client, or.The remote SCP process can operate in one of two modes: Normally, a client initiates an SSH connection to the remote host, and requests an SCP process to be started on the remote server. Like RCP, there is no RFC that defines the specifics of the protocol. Clients can also request files or directories from a server (download). A client can send (upload) files to a server, optionally including their basic attributes (permissions, timestamps). SCP uses Secure Shell (SSH) for data transfer and uses the same mechanisms for authentication, thereby ensuring the authenticity and confidentiality of the data in transit. The SCP is a network protocol, based on the BSD RCP protocol, which supports file transfers between hosts on a network. As of OpenSSH version 9.0, scp client therefore uses SFTP for file transfers by default instead of the legacy SCP/RCP protocol.

Īccording to OpenSSH developers in April 2019, SCP is outdated, inflexible and not readily fixed they recommend the use of more modern protocols like SFTP and rsync for file transfer. 'SCP' commonly refers to both the Secure Copy Protocol and the program itself. It is based on the Secure Shell (SSH) protocol. Secure copy protocol ( SCP) is a means of securely transferring computer files between a local host and a remote host or between two remote hosts. Network protocol for copying files between computers scp Developer(s)

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