#!/bin/bash
set -ue

# first arg is old user name, second arg is new user name
old_user=$1
new_user=$2

# rename user, user's group, and user's home dir
sudo mv /home/$old_user /home/$new_user
sudo groupmod -n $new_user $old_user
sudo usermod -l $new_user -d /home/$new_user -m $old_user