Issue with bash Dialog (Whiptail) progress bar

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                          I am trying to create a bash Dialog (whiptail) progress bar for a list of commands. So, that progress bar shows along with messages when the commands get executed one by one in the background. I am using whiptail, this is a Ubuntu server, so, I am not looking at GTK based utilities that require an Xserver e.g. Zenity, Yad etc. I am very new to bash scripting and I don't know where I am getting wrong any help is appreciated.

**System OS: Ubuntu 20.04**

**The Issue:**

> The messages are getting displayed all at once instead of stages/per
> command and all the commands start executing parallelly (all at once)
> instead of one by one. Is the code wrong? should I have used for loop
> instead of while loop, if then how?

**my list of commands:**

    {
    		sudo apt-get update -y
    		sudo apt-get install nginx -y
    		sudo systemctl reload nginx
    		sudo add-apt-repository ppa:ondrej/php -y
    		sudo apt-get -y install php-fpm
    		sudo apt-get install mariadb-server -y
    }
                

**This is the code for the progress bar:**

    #!/usr/bin/env bash
    (
    msgs=( "Preparing install..." "Starting Nginx installation..." "Nginx installation completed successfully" "Starting Mariadb installation..." "Starting PHP installation..." "PHP installation completed successfully" )
    items=$(
    		{
    			#echo "Preparing install..."
    			sudo apt-get update -y
    			#echo "Starting Nginx installation..."
    			sudo apt-get install nginx -y
    			#echo "Nginx installation completed successfully"
    			sudo systemctl reload nginx
    			#echo "Starting Mariadb installation..."
    			sudo apt-get install mariadb-server -y
    			#echo "Starting PHP installation..."
    			sudo add-apt-repository ppa:ondrej/php -y
    			sudo apt-get -y install php-fpm
    			#echo "PHP installation completed successfully"
    			sudo systemctl reload nginx
    		} | wc -l)
    processed=0
    while [ $processed -le $items ]; do
    	pct=$(( $processed * 100 / $items ))
    	echo "XXX"
    	echo $processed
    	echo ${msgs["$processed"]}
    	echo XXX
    	echo "$pct"
    	processed=$((processed+1))
    	sleep 1
    done
    ) | whiptail --title "Gauge" --gauge "Please wait..." 10 60 0

**These are the messages:**

msgs=( "Preparing install..." "Starting Nginx installation..." "Nginx installation completed successfully" "Starting Mariadb installation..." "Starting PHP installation..." "PHP installation completed successfully" )
                        
Asked by depar (89 rep)
Sep 16, 2021, 08:36 PM
Last activity: Sep 17, 2021, 11:33 AM
Issue with bash Dialog (Whiptail) progress bar

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