Linux script to add user and add into sudo

DevOps

Posted on July 10, 2025July 10, 2025 | by Rajesh Kumar

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#!/bin/bash
# Usage: sudo ./add_sudo_user.sh <username>

set -e

if [ -z "$1" ]; then
    echo "Usage: $0 <username>"
    exit 1
fi

USERNAME="$1"

# Create user with bash shell
sudo adduser --shell /bin/bash "$USERNAME"

# Add user to sudo group
sudo usermod -aG sudo "$USERNAME"

# Setup passwordless sudo
echo "$USERNAME ALL=(ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/"$USERNAME" > /dev/null
sudo chmod 0440 /etc/sudoers.d/"$USERNAME"

echo "User $USERNAME created and configured for passwordless sudo."Code language: PHP (php)

How to run this script?

vi adduser.sh
chmod 755 adduser.sh
./adduser.sh <<USERNAME>>