server-scripts/scripts/script-user-remove

#!/usr/bin/env bash
# Remove a user from the server
# Copyright 2021-2025 Bryan C. Roessler
# Licensed under the Apache License, Version 2.0
p="${BASH_SOURCE[0]%/*}"; [[ -r $p/script-functions ]] && . "$p"/script-functions || exit 1

is_root

echo "This script supports one optional argument, a username"

if [[ $# -eq 1 ]]; then
  user="$1"
else
  prompt user
fi

if ! id -u "$user" &>/dev/null; then
  echo "User $user does not exist"
  exit 1
fi

ask_ok "Remove user $user?" || exit 1

# Kill user processes
killall -u "$user"

# Optional backup
if ask_ok "Backup /home/$user?" && [[ -d /home/$user ]]; then
  backup_dir="/mnt/array/home-retired/$user"
  if [[ ! -d $backup_dir ]]; then 
    btrfs subvolume create "$backup_dir" || exit 1
  fi
  rsync -av "/home/$user/" "$backup_dir/" || exit 1
fi

# Remove from Samba and subuid/subgid
smbpasswd -x "$user"
sed -i "/^$user:/d" /etc/subuid
sed -i "/^$user:/d" /etc/subgid

# Remove user and home directory
if ! userdel -fr "$user"; then
  ask_ok "Userdel failed, kill processes again and retry?" || exit 1
  killall -u "$user" -s SIGKILL
  userdel -fr "$user"
fi