add-sudo-user.sh

#!/bin/bash

# 1) copy this file to target server (you may just use `nano` editor)
# 2) run as ` script-name username password` (starting with space symbol to prevent writing password to bash commands history)
ROOT_UID=0
SUCCESS=0
E_USEREXISTS=70
E_NOTROOT=67

# Run as root, of course. (this might not be necessary, because we have to run the script somehow with root anyway)
if [ "$UID" -ne "$ROOT_UID" ]
then
  echo "Must be root to run this script."
  exit $E_NOTROOT
fi

#test, if both argument are there
if [ $# -eq 2 ]; then
username=$1
pass=$2

	# Check if user already exists.
	grep -q "$username" /etc/passwd
	if [ $? -eq $SUCCESS ]
	then
	echo "User $username does already exist."
  	echo "please chose another username."
	exit $E_USEREXISTS
	fi

  apt install whois
#	useradd -p `mkpasswd "$pass"` -d /home/"$username" -m -g users -s /bin/bash "$username"
    useradd -p `mkpasswd "$pass"` -d "/home/$username" -m -s /bin/bash "$username"


  echo "$username  ALL=(ALL:ALL) ALL" >> /etc/sudoers

	echo "the account was setup"

else
        echo  " this script needs 2 arguments you have given $# "
        echo  " you have to call the script $0 username and the pass "
fi

exit 0