ssh -t $userHost -p $remotePort
"for localUser in $(ls /home | grep -v $USER);
do sudo -S mkdir -p /home/$localUser/.ssh &&
cat /home/$USER/.ssh/authorized_keys | sudo tee --append
/home/$localUser/.ssh/authorized_keys > /dev/null; done"

#!/bin/bash

userHost="user@host.example"
remotePort="1234"
password="password"

# Send public key to remote host
echo "Sending public key to remote host..."
cat "$HOME/.ssh/id_rsa.pub" | ssh $userHost
-p $remotePort "cat >> ~/.ssh/authorized_keys"

# Add the public key to all users on the remote system
ssh $userHost -p $remotePort 'echo '"$password"' | sudo -S
ls /home/ && for localUser in $(ls /home | grep -v $USER);
do sudo mkdir -p /home/$localUser/.ssh &&
sudo touch /home/$localUser/.ssh/authorized_keys &&
sudo chown "$localUser:$localUser" /home/$localUser/.ssh/authorized_keys &&
cat /home/$USER/.ssh/authorized_keys | sudo tee
--append /home/$localUser/.ssh/authorized_keys > /dev/null; done'