What is the command for secure file transfer over a network?

The command for secure file transfer over a network is represented by Secure File Transfer Protocol (SFTP). SFTP provides a secure channel for file transfer by using Secure Shell (SSH) for data communication. This protocol not only secures the data being transferred but also ensures secure authentication methods, providing a layer of encryption that protects sensitive information from being intercepted during the transfer.

SFTP is highly preferred for secure file transfers, particularly in environments where data security is paramount. It allows users to carry out operations like transferring files, modifying directories, and managing file permissions while maintaining a secure connection.

While SCP (Secure Copy Protocol) can also be used for secure file transfers, it is primarily focused on transferring files rather than a comprehensive file management system, as SFTP provides. This makes SFTP more versatile in various use cases involving file management on remote systems.

The other options, FTP and NFS, do not provide encryption for data transfers and are therefore not suitable for secure file transmission. FTP transmits data in plaintext, making it vulnerable to eavesdropping, while NFS is primarily designed for allowing multiple clients to access files over a network rather than secure file transfer.