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Just curious, is it possible to upload files set with setuid permission to directories using ftp and retain its setuid permission?

Or does FTP always change the permission?

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The FTP Specification doesn't provide a way to transmit file permission bits between systems. Which makes sense: FTP clients and servers run on a lot of different OSs with very different file permission semantics.

File permissions of uploaded files are part of the server's configuration.

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Have to add a bit of historical trivia. The original FTP spec mentions that FTP had already been implemented on the PDP-10 and a GE Multics system. Unix is not mentioned (only invented two years before) nor is Linux (Linus Thorvalds was 1 year old). We tend to think of Unix/Linux as the reference implementation of TCP/IP, but that was not always true. – Isaac Rabinovitch Sep 19 '12 at 5:59

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