SSH vs. SCP — What's the Difference?

SSH primarily facilitates secure remote access to a computer system, allowing users to execute commands and manage files on a remote server securely. SCP, on the other hand, is specifically designed for secure file transfer, utilizing SSH's secure channel to encrypt data during transfer.

With SSH, users can interactively log into another computer, perform tasks, and manipulate the operating system just as if they were using a local machine. Whereas, SCP provides a non-interactive file transfer capability, which means it operates without user intervention after the initial command.

SSH supports various functionalities including port forwarding, secure tunnels, and file editing via command line. In contrast, SCP’s sole function is the copying of files from one host to another, preserving the original files' attributes and timestamps.

SSH is used to create a secure and encrypted connection between two devices, which can be used for more than just command execution; it can also securely forward X Window System applications and encrypt other kinds of data communications. SCP, while also secure, is limited to copying files securely between hosts and does not support these additional features.

Both SSH and SCP require proper authentication to establish a connection, typically through passwords or cryptographic keys. However, SSH offers more flexibility in terms of what can be done once the connection is established, including file management and system administration.