A yes/no dialog box

• You can display a yes/no dialog box using the following syntax:

dialog --common-options --yesno text height width

• This dialog box is useful for asking questions that require the user to answer either yes or no.
• The dialog box has a Yes button and a No button, in which the user can switch between by pressing the TAB key.
• On exit, no text is written to dialog’s output. In addition to the "Yes" and "No" exit codes and ESC exit status may be returned as follows:
  • 0 - Yes chosen.
  • 1 - No chosen.
  • 255 - Escape key was pressed i.e. box closed.

Example

• Create a script called dynbox.sh:

#!/bin/bash
# dynbox.sh - Yes/No box demo
dialog --title "Delete file" \
--backtitle "Linux Shell Script Tutorial Example" \
--yesno "Are you sure you want to permanently delete \"/tmp/foo.txt\"?" 7 60
 
# Get exit status
# 0 means user hit [yes] button.
# 1 means user hit [no] button.
# 255 means user hit [Esc] key.
response=$?
case $response in
   0) echo "File deleted.";;
   1) echo "File not deleted.";;
   255) echo "[ESC] key pressed.";;
esac

Save and close the file. Run it as follows:

chmod +x dynbox.sh
./dynbox.sh

Asking questions that require the user to answer either yes or no