FTP vs SFTP vs FTPS: ports and safety
FTP uses TCP 21 plus a separate data channel, FTPS adds TLS, SFTP rides SSH on port 22. Which ports to open, and why plain FTP leaks your password.
#file-transfer
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Stream a directory over SSH with tar
Copy a directory to another server with tar and SSH: why -f - is needed, where -C goes, who owns the extracted files, and compression in the pipe.