May 29 2017

Determine Operating System within FTP Session

Published by at 10:57 pm under AS400,Linux

The “QUOTE” keyword is essential to allow a user to run system-specific commands on FTP servers (SITE or ALLO for example). These commands do not have to be understood by FTP clients.
Most FTP clients send a NOOP – that actually is a dummy packet – to keep the connection up

ftp> quote noop
200 NOOP ok.

QUOTE SYST returns the Operating System the FTP server runs on, or at least gives you a hint.
Check these 2 examples on Linux Redhat and IBM i, the second giving a lot more details than the first with the exact version of the operating system.

ftp> quote syst
215 UNIX Type: L8

ftp> quote syst
215  OS/400 is the remote operating system. The TCP/IP version is "V7R1M0".

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