Questions[wmctrl](ubuntu)

After several trial & error, I installed another image viewer on my remote machine (feh), setting in up— and tried the command once again.

feh WARNING: /tmp/feh_stdin_ZwCjv7 - No Imlib2 loader for that file format
feh: No loadable images specified.
See 'man feh' for detailed usage information

I think this is the problem that caused ImageMagick's display to burst out error.

display: no decode delegate for this image format `' @ error/constitute.c/ReadImage/501.

According to https://superuser.com/a/1517417/1106777, the command failed because I started display as a background job (&).

If the process is started with & then the shell will actually redirect its stdin from /dev/null to avoid any read attempts.

If I removed the trailing &, the command will ran without any problem, take an example of:

Working

ssh beer@laika "DISPLAY=:0 feh -" < <(cat 1.jpeg)

(Also) working

ssh beer@laika "DISPLAY=:0 display -" < <(cat 1.jpeg)

How to send stdin to background & job ?

Edit: I am not looking for other ways or better ways to change a window's title or to add titles to tabs in terminals. The answers in the proposed duplicate do not in any way come close to addressing the specific issue of why xdotool search … does not pick up window titles when the title is set by wmctrl as described above.

OS: Ubuntu 18.04

When I open a gnome-terminal window, the title is dkb@dkb:~

I can change it using

wmctrl -r :ACTIVE: -N "NewName"

but xdotool search …, doesn't "see" this title:

dkb@dkb:~$ xdotool search --name NewName
dkb@dkb:~$ 

I just get back the prompt instead of being provided the corresponding window identifier.

On the other hand, I can use xdotool itself to set the title and then xdotool search … provides the window identifier:

dkb@dkb:~$ xdotool getactivewindow set_window --name NewName
dkb@dkb:~$ xdotool search --name NewName
39845894
dkb@dkb:~$ 

In other words, if the title is set by xdotool, xdotool search works as it should:

From man xdotool

search [options] pattern Search for windows with titles, names, or classes with a regular expression pattern. The output is line-delimited list of X window identifiers.

So while it's not a big deal, I'd like to know what the reason is for xdotool not "seeing" the window title set by wmctrl.

I have a bash script that moves my windows from the left screen to right screen in dual-screen setup. Currently the way it works is cycling through the window ids that are given by xdotool search --onlyvisible --maxdepth 2 --class "" and then moves them to the right by the screen width. It already works... unless the window in question is maximises or minimised.

So what is needed is a way to check the current status of the window. I have found an answer that provides the way to add and remove those bits, but where is the way to check if they are set already?

If it is not possible to do via xdotool, it should be possible to reuse the window id provided by the command mentioned above.

After trying the answers in this question: How to start an app with "Always On Top" set?, specially the one in the comments by @MichaelTunnell:

This is the best option for me because I can create a bash script or a keyboard shortcut (which I did) using this command and that way I can use it when I need it but not when I don't. I did make a change though...I wanted a shortcut to turn always on top for the active window and only when I needed so here is my command. wmctrl -r :ACTIVE: -b toggle,above

I was able to toggle always on top in Ubuntu 16.10 or below, but not on Ubuntu 17.10 which is the one I have installed right now and would like to have this same shortcut

I have also tried this post which is basically a more detailed post of the comment of Michael Tunnell: Keyboard shortcut for always on top Ubuntu

The shortcut can be seen in the image below and it works for setting the window Always-on-top to True, but even if I use the same command again to "turn it off", I can't get the active application to remove that property.

Is this a bug in GNOME Ubuntu 17.10? Or am I missing any extra configuration in this particular version?

How to get the window ID of the focus(active) window in Hex ?