Secure file transfer program
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Contrary to its name, the sftp command is not an SFTP client (SSH File Transfer Protocol), but it is an FTP-over-SSH client (an FTP client over an SSH tunnel).
In fact, SFTP can designate two different TCP/IP protocols:
- SSH File Transfer Protocol (the today's main meaning)
- Secure File Transfer Protocol (replaced by 'FTP over SSH')
sftp is part of the OpenSSH project.