/usr/sbin/addrconsole is in remote-tty 4.0-13build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | #!/bin/sh
echo -n "Username : "
read USERNAME
echo -n "Serial port (no need for /dev/): "
read PORT
ln -s /dev/$PORT /etc/remote-tty/dev/$USERNAME
echo "rttymgr:$USERNAME" > /etc/remote-tty/owner/$USERNAME.sock
adduser --home /var/log/remote-tty/$USERNAME \
--gecos "$USERNAME Serial Console" $USERNAME
chsh -s /usr/bin/rconsole-user $USERNAME
addgroup rttymgr $USERNAME
chown $USERNAME:rttymgr /var/log/remote-tty/$USERNAME
chmod 775 /var/log/remote-tty/$USERNAME
cd /etc/remote-tty/dev
su - rttymgr -c "/usr/sbin/startsrv $USERNAME"
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