https://help.gnome.org/users/zenity/stable/

Zenity permet de créer uniquement des dialogues en bash. Pas de fenêtre mère.

Exemple calendrier:

#!/bin/sh

if zenity --calendar \
--title="Select a Date" \
--text="Click on a date to select that date." \
--day=10 --month=8 --year=2004
  then echo $?
  else echo "No date selected"
fi

Exemple file selection:

#!/bin/sh

FILE=`zenity --file-selection --title="Select a File"`

case $? in
         0)
                echo "\"$FILE\" selected.";;
         1)
                echo "No file selected.";;
        -1)
                echo "An unexpected error has occurred.";;
esac