mkuser.sh

#!/usr/bin/bash
#title          :mkuser.sh
#description    :This script will make random password for root, new user, new user as sudo, clear history
#author		:Trle94 @ Castlegem SRL
#date           :03.04.2018
#version        :0.1    
#usage		:./mkuser.sh
#--------------------------------------------------------------------------------

[ $EUID -eq 0 ] || { echo "This script needs to be ran with SUDO!"; exit 1; }

#---------------COLOR PALLETE--------------
RED='\033[1;31m'
NC='\033[0m' # No Color
GREEN='\033[1;32m'
BLUE='\033[0;34m'
MAGENTA='\033[0;35m'
CYAN='\033[0;36m'
#------------------------------------------
#---------------QUESION FUNCTION--------------
AQ() {
    local prompt default reply
    while true; do

        if [ "${2:-}" = "Y" ]; then
            prompt="Y/n"
            default=Y
        elif [ "${2:-}" = "N" ]; then
            prompt="y/N"
            default=N
        else
            prompt="y/n"
            default=
        fi

        echo -e "$1 [$prompt] "
        read reply </dev/tty

        # Default answer check
        if [ -z "$reply" ]; then
            reply=$default
        fi

        # Check if the reply is valid
        case "$reply" in
            Y*|y*) return 0 ;;
            N*|n*) return 1 ;;
        esac

    done
}
#------------------------------------------

#------------------------------------------
#--------Main function goes here-----------
#------------------------------------------
echo -e "Hi, please enter password length[INT]: \c "
read -r LENG_PASSWD
if [[ -z "${LENG_PASSWD//[0-9]}" ]] && [[ -n "$LENG_PASSWD" ]];then #Check if password length has numbers only and not empty
    # declare NEW_PASSWD variable/ generating password
	NEW_PASSWD=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9!@#$' | fold -w $LENG_PASSWD | head -n 1)
	#Changing user password!! echo new password if success or exit if failed!
	echo -e "$NEW_PASSWD\n$NEW_PASSWD" | passwd root &>/dev/null && { echo -e "Your "${GREEN}"root"${NC}" password has been updated, new password is:" ${CYAN}$NEW_PASSWD${NC}; } \
	|| { echo -e ${RED}"Password change failed!"${NC} ; exit 1; }
	# Question creating new user
	if AQ "Would you like to create new user?" Y; then 
		echo -e "Enter new username: \c "
		read -r NewUser
		if [[ -z "${NewUser//[a-z]}" ]] && [[ -n "$NewUser" ]];then	#Check if user has letters only and not empty
			useradd $NewUser #Adding new user
			echo -e "$NEW_PASSWD\n$NEW_PASSWD" | passwd ${NewUser} &>/dev/null && { echo -e "Your "${GREEN}${NewUser}${NC}" password has been updated, new password is:" ${CYAN}$NEW_PASSWD${NC}; } \
			|| { echo -e ${RED}"Password change failed!"${NC} ; exit 1; } #Setting password to created user same as root one
			
			if AQ "Would you like to add new user to sudoers?" Y; then #Adding new user to SUDOERS
				echo -e ${NewUser}"	ALL=(ALL) 	ALL" >> /etc/sudoers
			fi
		else # If check failed start from begin!!
			echo -e ${CYAN}"Please, use letters only!"${NC} 
			exec "$0" "$@"
		fi
	fi
else	# If check failed start from begin!!
    echo -e ${CYAN}"Please, enter integer!"${NC}
	exec "$0" "$@"
fi

if AQ "Would you like to clean history and exit?" Y; then # Clearing history and leaving!!
cat /dev/null > ~/.bash_history && history -c && history -w && rm $0 && exit 
fi