Menu for using with X11Vnc Server and Remmina

#!/usr/bin/env bash
# MD Harrington
# Menu for  using with X11Vnc and Remmina
# Date today 08/10/2020

STD='\033[0;0;39m'        #reset
IRed='\033[0;91m'         # Red
IGreen='\033[0;92m'       # Green
IYellow='\033[0;93m'      # Yellow
IBlue='\033[0;94m'        # Blue
IPurple='\033[0;95m'      # Purple
ICyan='\033[0;96m'        # Cyan
IWhite='\033[0;97m'       # White

#global variable
CURRENTDATEONLY=`date +"%A, %b %d, %Y %H:%M:%S"`

pause(){

  read -p "Press [Enter] to continue..." p_EnterKey
}


one(){
    echo "${IGreen}Starting X11Vnc Server${STD}"

## Start up file for x11vnc server change  - allow for  your ip
## for local  subnet  eg 192.168.100  end this last octed with a dot
## for multiple  hosts  then  seperate ip wih  ,  and change  -nevershared to -shared
## and change rfbport to autoport

##  ALL COMMANDS CAN BE FOUND ON THIS PAGE (X11VNC)
##  https://linux.die.net/man/1/x11vnc

x11vnc -nevershared -forever  -rfbauth ~/.vnc/passwd  -allow 192.168.1. -rfbport 5902

pause
}

# do something in two()
two(){
    echo "${IGreen}Stop X11Vnc Server${STD}"
    ## stop X11 server

    x11vnc -R stop
        pause
}

three(){
          echo "${IPurple}Quitting stopping VNC Server Thankyou ${STD}"
          x11vnc -R stop
          sleep 500
            exit 0

}

show_menus() {
    clear
    echo -e "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
    echo -e "  M A I N - M E N U - V N C - S E R V E R "
    echo -e "            MD HARRINGTON                 "
    echo -e "${IRed}* Date : ${CURRENTDATEONLY} *${STD}"
    echo -e "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
    echo -e "${ICyan}1. Start VNC Server ${STD}"
    echo -e "${ICyan}2. Stop  VNC Server ${STD}"
    echo -e "${ICyan}3. Exit altogether and Menu Application ${STD}"

}
# read input from the keyboard and take a action
# invoke the one() when the user select 1 from the menu option.
# invoke the two() when the user select 2 from the menu option.
# Exit when user the user select 3 form the menu option.
read_options(){
    local choice
    read -p " Enter choice [ 1 - 4] " choice
    case $choice in
        1) one ;;
        2) two ;;
        3) three ;;
        *) echo -e "${RED}Error...${STD}" && sleep 2
    esac
}



# ----------------------------------------------
# Step #3: Trap CTRL+C, CTRL+Z and quit singles
# ----------------------------------------------
trap '' SIGINT SIGQUIT SIGTSTP

while true
do

    show_menus
    read_options
done