Re: It is possible that this can be a bug

[Dennis Williamson]

On Mon, Jun 26, 2023, 11:07 AM Hugo Napoli <hugonapoli@gmail.com> wrote:

> Good day.
>
> Something strange is happening to me with this script that I have designed
> moments ago.
> I am a Computer Science professor, and among the subjects I teach, there is
> one that has to do with BASH programming.
> I make my own material, therefore, I have been working since last year with
> this compendium of exercises that I have created, but I had never noticed
> before that the BASH output of this program could be a "bug".
> If not, I apologize and I'm sorry for wasting your time.
>
> *This is the script code, exactly as I have it in my computer:*
>
> #!/bin/bash
>
> clear
>
> echo ""
> read -p "Ingrese  un  número entero de hasta 2 cifras
>   : " min
> read -p "Ingrese otro número entero de hasta 2 cifras, mayor que el
> anterior  : " max
>
> if [[ ${#min} -gt 2 ]] || [[ ${#max} -gt 2 ]];then
>     clear
>     echo "" && echo "Deben ser números de hasta 2 cifras..."
>     read -p "Pulse ENTER para continuar..."
>     bash "$0"
> fi
>
> if [[ $min == $max ]];then
>     suma=$((min+max))
> else
>     for((c=$min;c<=max;c+=1))
>     do
>         suma=$((suma+c))
>     done
> fi
>
> echo ""
> echo "La suma entre "$min" y "$max", es "$suma"."
> echo ""
>
> *This is the output when I type "222" and "222" for min and max,
> respectively, and in the next try, I enter "2" and "2":*
>
> Ingrese  un  número entero de hasta 2 cifras                         : 2
> Ingrese otro número entero de hasta 2 cifras, mayor que el anterior  : 2
>
> La suma entre 2 y 2, es 4.
>
>
>
> *La suma entre 222 y 222, es 444.*
>
> What is in red is what I understand should not happen: the program repeats
> the same operation, when the "bash $0" is supposed to reinitialize the
> program and show only one result, not 2.
> And if I enter 3, 4, or 5 wrong values, I get 3, 4, 5 additional results,
> respectively.
>
> Before writing this report, I ran the same script on Arch Linux, getting
> exactly the same results.
>
> *I'm using openSUSE 15.4 (Leap, updated until today and phisically
> installed, not virtualized) with "KDE Plasma desktop 5.24.4, Frameworks
> 5.90.0, Qt 5.15.2 running on X11" and kernel "5.14.21-150400.24.63-default"
> and I execute all my scripts in "Konsole", now in 21.12.3 version. The
> hardware is AMD Ryzen 3 3200U in an ACER Aspire 5 machine.*
>
> I will be at your service for whatever you need to ask me.
>
> Receive a warm hug from Uruguay,
>
>
> *Hugo Napoli*
>
> *Espacio educativo en YouTube:
> https://www.youtube.com/c/entropíabinaria
> <https://www.youtube.com/c/entropíabinaria>*
> *Sitio web personal:                **https://hugonapoli.blogspot.com/*
> <https://hugonapoli.blogspot.com/>
>
> *Si vas a reenviar este correo:*
> *-* te agradezco que antes de hacerlo, elimines mi dirección de correo
> electrónico.
> *-* en lugar de poner las direcciones en el renglón "PARA", ponlas en
> "CCO". De este modo,
>   estarás contribuyendo a que tus contactos no reciban virus y spam por
> mail.
> *>* Utilicemos el correo electrónico con responsabilidad.
>
> *Haz clic aquí para informarte en Wikipedia*
> <http://es.wikipedia.org/wiki/Spam>
>

bash "$0"

calls the script as a sub-program without any arguments.

To replace the current script with a new instance use

exec bash "$0"