New answers tagged multiuser
You could get the username from the UID, passing that to passwd. passwd $(id -nu $UID)
There is an option in sshd config file with path /etc/ssh/sshd.config. Find PermitEmptyPasswords in the file and change it to yes, and you can have user without login passwords, I don't think that will be good practice though . chnage this PermitEmptyPasswords no to PermitEmptyPasswords yes
I do not think you can. Linux is based on user separation, and users need a password to login most display managers (or other methods like SSH). I think GDM will allow passwordless logins (http://ubuntuforums.org/showthread.php?t=123116) but the users still need a password, and you will still have to enter it for some things (like keyring). You might be ...
You can remove their passwords since you want them to autologin. On terminal sudo passwd user1 -d for all three of them. They will not have any password. Also if your users has sudo privileges I assume they do then you need to user1 ALL=(ALL) NOPASSWD:ALL on sudoers file for three users
Since you do not specify if you are using OS X Server or not, let me presume not and suggest that you might be violating the EULA: 2H. Remote Desktop Connections. Subject to the terms and conditions of this License, when remotely connecting from another computer or electronic device (each a “Device”) to an Apple- branded computer that is running ...
OS X in itself is a multi-tasking, multi-user OS, but VNC is desktop control software, so software that controls 1 desktop (unless set up in such a way that multiple virtual desktops can be controlled remotely). So what you're seeing is standard behaviour of the software you're using, not of the underlying OS... ;-)
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