Create a new user, with a random password, allowing public key authentication

setup_user.sh

#!/bin/sh
# Usage: setup_user.sh <username> <path-to-pub-key>
#
# Credit to TechRepublic.com for inspiration: 
USERNAME=$1
KEYPATH=$2

useradd -s /bin/bash -m $USERNAME
openssl rand -base64 8 | tee -a /home/$USERNAME/.password | passwd --stdin $USERNAME
chmod 600 /home/$USERNAME/.password
mkdir -p /home/$USERNAME/.ssh
chmod 700 /home/$USERNAME/.ssh
cp $KEYPATH /home/$USERNAME/.ssh/authorized_keys
chmod 600 /home/$USERNAME/.ssh/authorized_keys
chown -R $USERNAME:$USERNAME /home/$USERNAME/.ssh