zenity: add page (#1687)

pages/linux/zenity.md

@@ -0,0 +1,24 @@
+# zenity
+
+> Display dialogs from the command line/shell scripts.
+> Return user-inserted values or 1 if error.
+
+- Display the default question dialog:
+
+`zenity --question`
+
+- Display an info dialog displaying the text "Hello!":
+
+`zenity --info --text="{{Hello!}}"`
+
+- Display a name/password form and output the data separated by ";":
+
+`zenity --forms --add-entry="{{Name}}" --add-password="{{Password}}" --separator="{{;}}"`
+
+- Display a file selection form in which the user can only select directories:
+
+`zenity --file-selection --directory`
+
+- Display a progress bar which updates its message every second and show a progress percent:
+
+`{{(echo "#1"; sleep 1; echo "50"; echo "#2"; sleep 1; echo "100")}} | zenity --progress`