Questions[yad](ubuntu)

I'm using YAD to create a "app store" with a GUI and I can't find any tutorial on how to execute a command when I select an option from a list and click on the 'ok' button ('ok' will be replaced with 'install'). I want to use shell script only.

This is the script I wrote. It's a simple list with 2 columns and 2 items in them. The windows icon is just a test.

yad --list --center --width=800 --height=600 
--title "apps4pi" \
--column "app name" --column "description" \
SimpleScreenRecorder " powerful feature packed yet simple and easy to use screen recorder" \
System-Tools "system maintenance commands all done for you"

yad notifications (https://sourceforge.net/p/yad-dialog/wiki/NotificationIcon/) like in this example are not displayed:

yad --notification --image="gtk-help" --command="echo 'Hello World'" --text="The notification's tooltip"

I guess it has to do with gnome shell. How can I show the yad notification?

GNOME Shell 3.34.1 Ubuntu 19.10

I used gnome tweaks to enable Ubuntu Appindicators to no effect.

I have the following twenty-six files in a folder:

$ ls
a.txt  c.txt  e.txt  g.txt  i.txt  k.txt  m.txt  o.txt  q.txt  s.txt  u.txt  w.txt  y.txt
b.txt  d.txt  f.txt  h.txt  j.txt  l.txt  n.txt  p.txt  r.txt  t.txt  v.txt  x.txt  z.txt
$

I can use Zenity like this:

zenity --list --title=Test --width=275 --height=400 --column="File names" *.txt

and get this interface initially:

If I want to select a file lower down the list, say, r.txt, I press r and r.txt is selected.

However, if I use Yad instead of Zenity like this:

yad --list --title=Test --width=275 --height=400 --column="File names" *.txt

pressing r does nothing. I have to use the arrow keys to scroll through the list until I come to r.txt.

My understanding is that Yad has more features than Zenity. So is there some way to get Yad to do what Zenity does?

(Tested using the repository versions of Yad and Zenity found in 18.04 and 19.10.)

I need a script to check if yad (and other programs) version number is >= to a specific number. For example I have:

$ yad --version
0.40.0 (GTK+ 3.24.8)

$ gedit --version
gedit - Version 3.32.0

$ bash --version
GNU bash, version 5.0.3(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2019 Free Software Foundation, Inc.

• For yad new features are added between Ubuntu 16.04 and 19.04
• For gedit the ability to pass Window geometry is lost in newer versions
• bash complicates tests as the version number is in the middle of the first line.

An environment variable will not exist for all programs like bash has:

$ echo $BASH_VERSION
5.0.3(1)-release

Recently I've been encountering many questions in Ask Ubuntu that require changing gsettings to solve the problem. For example this question: How to prevent shutdown when one of two batteries is empty? references a gsettings that is new to me:

org.gnome.settings-daemon.plugins.power use-time-for-policy false

Rather than stumble across gsettings randomly every week (or so it seems), is there a bash one-liner to dump all the current gsettings to zenity (or yad) so I can scroll through everything?