make-user.sh

#!/bin/bash

set -e

USAGE="$0 <username> <ssh_pubkey> <group,groups>"

if [  -z ${1+x} ]; then echo $USAGE; exit 1; fi
if [  -z ${2+x} ]; then echo $USAGE; exit 1; fi

USERNAME=$1
USERPUBKEY=$2
GROUPS=$3

if [ "$(id -u)" != "0" ]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi


# Create the user
/usr/sbin/useradd -m $USERNAME -s /bin/bash
passwd -d $USERNAME
chage -d 0 $USERNAME
cd /home/$USERNAME
# make the .ssh dir
mkdir .ssh
# Put the public key into the special file in the .ssh dir
echo $USERPUBKEY > .ssh/authorized_keys
# Set permissions
chmod 700 .ssh
chmod 600 .ssh/authorized_keys
chown -R ${USERNAME}:${USERNAME} .ssh

#
# Optionally set user as root (admin)
/usr/sbin/usermod -a -G $3 $USERNAME