add_new_sudo_user.sh

#!/bin/bash

# Check if the script is run as root
if [ "$(id -u)" -ne 0 ]; then
  echo "This script must be run as root." >&2
  exit 1
fi

# Prompt for the username
read -p "Enter the username for the new user: " username

# Add the new user
useradd -m -s /bin/bash "$username"
if [ $? -ne 0 ]; then
  echo "Failed to add user $username" >&2
  exit 1
fi

# Add the user to the sudo group
usermod -aG sudo "$username"
if [ $? -ne 0 ]; then
  echo "Failed to add user $username to the sudo group" >&2
  exit 1
fi

# Create the .ssh directory and authorized_keys file
mkdir -p /home/"$username"/.ssh
touch /home/"$username"/.ssh/authorized_keys
if [ $? -ne 0 ]; then
  echo "Failed to create .ssh directory or authorized_keys file for $username" >&2
  exit 1
fi

# Set the correct permissions
chown -R "$username":"$username" /home/"$username"/.ssh
chmod 700 /home/"$username"/.ssh
chmod 600 /home/"$username"/.ssh/authorized_keys
if [ $? -ne 0 ]; then
  echo "Failed to set the correct permissions for .ssh directory or authorized_keys file for $username" >&2
  exit 1
fi

# Prompt for the public key and add it to the authorized_keys file
read -p "Enter the public key for the new user: " pubkey
echo "$pubkey" > /home/"$username"/.ssh/authorized_keys
if [ $? -ne 0 ]; then
  echo "Failed to add the public key to authorized_keys file for $username" >&2
  exit 1
fi

echo "User $username has been added to the sudo group and .ssh directory has been set up with the correct permissions and the public key."