How to get result of selection of menu gdialog in variable in Shell Script?

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How to get result of selection of menu gdialog in variable in Shell Script?

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#1 by (4 votes)
#2 by (1 votes)

5

I'm creating a simple script for learning in which the user should:

Type number to be saved in variable NUM1
Enter a second number that will be saved in variable NUM2
Choose from the menu if it wants to add, subtract, multiply or divide these numbers.

After these procedures, it should appear in the terminal "The option chosen was: sum (such as if it had chosen subtraction, subtraction would appear there [without accent because it is the variable that I want to appear]

Code I created:

#!/bin/bash

clear

NUM1=$( gdialog --inputbox "Informe o número 1"
gdialog --title 'Aviso' )

NUM2=$( gdialog --inputbox "Informe o número 2"
gdialog --title 'Aviso')

escolha=$( gdialog \
           --menu 'Escolha:' \
           0 0 0 \
           soma '+' \
           subtracao '-' \
           multiplicacao '*' \
           divisao '/' )

echo "A opção escolhida foi: $escolha"

exit

Problem: When I run, I do all the procedures as user until the choice in the menu, appears in the terminal what was chosen, however, is not what I asked to appear and immediately below "The option chosen was:" and does not appear variable on the front.

I would like this variable to appear to see that it is actually being saved in $ choice, so I can find a way to use the switch case and finish my script.

NOTE: I use gdialog for visual mode.

script shell shell-script

asked by anonymous 09.03.2017 / 17:56

2 answers

4

I took the liberty of changing your script to a more simplified and readable way, thus:

#!/bin/bash

operacao=""

echo "Digite o primeiro valor"
read valor1
sleep 3
echo ""
echo "Digite o segundo valor"
read valor 2
sleep 3
echo ""
echo "Escolha a operação: "
echo "1 - soma"
echo "2 - Subtração"
echo "3 - Multiplicação"
echo "4 - Divisão"
read operacao
case $operacao in
    1) operacao="Soma" ;;
    2) operacao="Subtração" ;;
    3) operacao="Multiplicação" ;;
    4) operacao="Divisão" ;;
    *) echo "Opção inválida" ; exit ;;
esac

echo "A opção foi: $operacao"

09.03.2017 / 18:18

Run a function while holding button, stop when releasing How to use the toupper () function in char in C?

score 1 · Accepted Answer

Short answer: gdialog sends the output to and STDERR; so you need to redirect STDERR to STOUT or to join 2>&1 to invocations of gdialog :

escolha=$(gdialog .......... 2>&1)

Eventually lurks zenity

num1=$(zenity --title "Aviso" --entry --text "numero 1")

As a slightly different philosophy, I suggest the gtkdialog

#! /bin/bash

export MAIN_DIALOG='
 <vbox>
  <hbox>
    <entry> <variable>E1</variable> </entry>
    <entry> <variable>E2</variable> </entry>
  </hbox>
  <hbox>
    <button> <label>+</label> <action> echo $(($E1+$E2))</action> </button>
    <button> <label>-</label> <action> echo $(($E1-$E2))</action> </button>
    <button> <label>*</label> <action> echo $(($E1*$E2))</action> </button>
    <button> <label>/</label> <action> echo $(($E1/$E2))</action> </button>
    <button ok></button>
  </hbox>
 </vbox>'

gtkdialog --program=MAIN_DIALOG