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I want give some people FTP access to the files of unix user bob. Since bob has sudo, I don't want to share his unix password.

How can I make sure FTP users have the same file rights as bob without giving his password?


Note 1 : I currently use VSFTPD, but I'm happy with any CLI FTP server.

Note 2 : Ideally, I would like to setup an FTP-only password which connects as bob. Having a new user, say alice, with the same rights as bob, would be fine too, but I want any future file created by bob to be immediately read/writable by alice as well!

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All you need to do is to add alice user into bob's group,
since bob is the creator and owner of the files.

To check who is the owner of a file, use

$ ls -l filename

To see which groups bob is registered in, use

$ groups bob

To add existing user alice to a group, use

# usermod -a -G groupname alice

Also check this out, for more on user management.

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