Pre-intro  § 

Continued from GNU Proofreaders shut down, and a rant on documentation.

wmctrl is one of very few programs which give control over your various windows within X. kde (with a GUI) and openbox (via rc.xml) have a way, and some other applications include Devil's Pie, and some tools which come with X; xdpyinfo; xprop; xlsclients; xlsatoms; and xwininfo. Please contact me if you find any other interesting tools.

Notice that in this list there are two third-party programs. Two. Of all of these, wmctrl seems to be the only tool which can actually do things to an existing window from the commandline. It was last updated in 2005. Seriously, we all use X daily but the tools are .. I don't even have the words; welcome to the world of Linux.

I'm not even going to go into the rant of users needing creating the documentation for the software they use. I've already covered that in my previous post.

Introduction  § 

Sometime in 2007 I did a lot of work to figure wmctrl out. I essentially cleaned up its man page and created examples. I also came up with quite a number of questions along the way. Just the other day I was prompted to find those old notes and post them. I intended to get wmctrl and re-test things, but I have issues compiling it, probably because of my 64bit awesomeness and newer x libraries. .. and that damned type declaration. I don't feel like hacking around in the wmctrl source code (right now?) or getting help for it, but I'll get those notes for you anyway. The notes ought to still be good since the "latest" wmctrl version has not changed. However, the transition from one format to another might mean there are odd mistakes (missing spaces, incorrect characters) so please contact me if you have any issues or you'd like an update. This is probably the best piece of documentation on wmctrl and I demand perfection out of my docs. I'm the kind of guy who will put two spaces after a period in HTML (where the second is discarded).

There are two reasons I was hesitant to just copy-and-paste my notes. One is that I intended to put them up on my CMS when it got built. The other is that I really wanted to re-test everything and provide even better examples. I've learned in the few years that I've played with wmctrl, and I'm positive I could build some cool scripts to really help people out. But until things come together, I suppose this'll get trapped in a blog post.

Blogs are SO inappropriate for resources like this which ought to be kept up-to-date. Wikis ftw.

Show information about the window manager and about the environment.  § 

wmctrl -m 
 
Name: Blackbox 
Class: N/A 
PID: N/A 
Window manager's "showing the desktop" mode: N/A

List windows managed by the window manager.  § 

wmctrl -l 
 
0x0080006a -1 localhost panel 
0x0180007c  0 localhost Mozilla Firefox 
0x02600007  3 localhost user@localhost: /home/user - Shell - Konsole 
0x00600011  1 localhost KTorrent 
0x02200007  0 localhost user@localhost: /home/user - Shell - Konsole 
1           2 3         4

The columns:

1. The window ID. This is used for the [#i -i] switch.
2. The desktop ID. It begins counting at 0. -1 means that window is on all desktops. Used with [#d -d] and more.
3. The client machine
4. The name (long title) of the window. Used with [#r -r] mostly, and can be renamed with [#N -N] and [#T -T].

List desktops.  § 

List desktops. The current desktop is marked with an asterisk.

wmctrl -d 
 
0  * DG: 1920x1200  VP: 0,0  WA: 0,0 1920x1200 
1  - DG: 1920x1200  VP: N/A  WA: 0,0 1920x1200 
2  - DG: 1920x1200  VP: N/A  WA: 0,0 1920x1200 
3  - DG: 1920x1200  VP: N/A  WA: 0,0 1920x1200 
1  2 3              4        5

The columns:

1. the desktop number. It begins counting at 0.
2. '*' means it's the current desktop
3. geometry
4. viewport
5. workarea
6. TODO: title -- the man page describes this, but it's missing from the command. File a bug report.

Switch to the specified desktop.  § 

# Create two desktops: 
wmctrl [#n -n] 1 
# Switch to desktop 1 
wmctrl -s 1

notes

• The programmer starts counting at 0. So 1 means the second desktop.
• Your window manager must be configured to provide multiple desktops for this to mean anything.

Activate a window.  § 

Activate the window by switching to its desktop and raising it.

# Create two desktops: 
wmctrl [#n -n] 1 
# Switch to desktop 1: 
wmctrl [#s -s] 0 
# Move the window to another desktop: 
wmctrl [#r -r] "KTorrent" -t 1 
# Activate the window by switching to its desktop and raising it: 
wmctrl -a "KTorrent"

notes:

• TODO: With a tray-enabled application like KTorrent, activating it while it's minimized as a tray icon is a Bad Idea and won't display it properly. You'd have to 'restore' it from its tray state - by right-clicking its tray icon and selecting 'restore'. Explore a wmctrl-only example.

Close the window gracefully.  § 

wmctrl -c [#r -r] "KTorrent"

notes:

• TODO: With a tray-enabled application like KTorrent, closing it will minimize it to the tray. If it's already in the tray, then -c won't do anything. wmctrl doesn't have an alternate close or a 'kill' command for this case. Request this feature.
• Does not work with mousepad.

Move the window to the current desktop and activate it.  § 

# Create two desktops: 
wmctrl [#n -n] 1 
# Switch to desktop 1: 
wmctrl [#s -s] 0 
# Move the window to another desktop: 
wmctrl [#r -r] "KTorrent" -t 1 
# Switch to that window's desktop and activate that window: 
wmctrl -R "KTorrent"

notes:

• With a tray-enabled application like KTorrent, activating it while it's minimized as a tray icon is a Bad Idea and won't display it properly. You'd have to 'restore' it from its tray state - by right-clicking its tray icon and selecting 'restore'.

Move the window to the specified desktop.  § 

# Create two desktops: 
wmctrl [#n -n] 1 
# Switch to desktop 1: 
wmctrl [#s -s] 0 
# Move the window to another desktop: 
wmctrl [#r -r] "KTorrent" -t 1

notes:

• Tray-enabled applications like KTorrent won't go anywhere if they're minimized to the tray.

Resize and move the window around the desktop.  § 

wmctrl [#r -r] "KTorrent" -e 1,0,0,800,600 
                             1 2 3 4   5

This example will move the window to the top-left of the screen (0,0) and resize it to 800x600 pixels. The five options are: "gravity,X,Y,width,height":

1. gravity -- I'm not sure what this
   1. 0 means 'default' and the coordinates of 0,0 will move the window too high up.
   2. 1 seems to look good for me.
2. X -- The X coordinates. How far from the left the window will begin. Use -1 to leave this value as-is.
3. Y -- The Y coordinates. How far from the top the window will begin. Use -1 to leave this value as-is.
4. width -- The new window width in pixels Use -1 to leave this value as-is.
5. height -- The new window hight in pixels. Use -1 to leave this value as-is.

notes:

• "gravity,X,Y,width,height" follows The EWMH specification describes 'gravity' thusly:

  win_gravity:      placed at the reference point 
   
  StaticGravity     the left top corner of the client window 
  NorthWestGravity  the left top corner of the frame window 
  NorthGravity      the center of the frame window's top side 
  NorthEastGravity  the right top corner of the frame window 
  EastGravity       the center of the frame window's right side 
  SouthEastGravity  the right bottom corner of the frame window 
  SouthGravity      the center of the frame window's bottom side 
  SouthWestGravity  the left bottom corner of the frame window 
  WestGravity       the center of the frame window's left side 
  CenterGravity     the center of the frame window
  

  But wmctrl doesn't seem to respect these. It expects an integer.

Change the state of the window.  § 

Change the state of the window. Using this option it's possible for example to make the window maximized, minimized or fullscreen.

wmctrl supports these properties:

• modal -- doesn't seem to do anything, but I don't really understand it anyway.
• sticky -- doesn't work
• maximized_vert -- works
• maximized_horz -- works
• shaded -- works
• skip_taskbar -- works, but I can't add it back. =/
• skip_pager -- works
• hidden -- does not work, and really shouldn't since the 'minimize' action would be responsible for setting this. Except wmctrl doesn't have that. =/
• fullscreen -- works. Removes the window title and border and forces fullscreen.
• • 1.07 fullscreen issue (see below)
• above -- works
• below -- works
• TODO: demands_attention -- this is defined in the EWMH specs but was not listed in the wmctrl manual and does not appear to be supported. Request it.

Examples:

wmctrl [#r -r] "KTorrent" -b add,shaded 
wmctrl [#r -r] "KTorrent" -b remove,shaded 
wmctrl [#r -r] "KTorrent" -b toggle,shaded

Multiple commands at once are done like this:

wmctrl [#r -r] "KTorrent" -b toggle,shaded,maximized_horz

Set the long title of the window.  § 

Set the name (long title) of the window.

wmctrl [#r -r] "KTorrent" -N "something" 
wmctrl [#r -r] "something" -N "KTorrent"

notes:

• Changing it back doesn't seem to work.
• Warning: This influences the use of the [#r -r] switch!
• This is great for testing on an xterm shell if your environment automatically changes the title for you. Then you can just change directories to get things restored nicely.
• For KTorrent after the first time I use this wmctrl feature I have to minimize it to the tray and restore it to view the change.

Their example shows 'zenity' but I prefer kdialog. In a terminal emulator window, do:

title=`kdialog --title "Change window title" \ 
  --inputbox "New window title"`; \ 
  wmctrl -r :SELECT: -T "$title"

complex stuff:

It would be nice if I could have regular expressions which could match a title. I can partially understand how it could be done, but I don't want to bother implementing the feature myself. =/ Some nonsense like this:

wmtrl -r `wmtrl -l|grep title|othergrep <first 10 characters>` -N "new title"

Where the othergrep thing matches the 10 characters at the beginning of each line. I don't know how to do that though. Something like (^..........) or (^.{10}) I think.

Set the short title of the window.  § 

Set the icon name (short title) of the window.

wmctrl -r "KTorrent" -I "string"

notes:

• See [#N -N] for more info.
• I'm not sure what this is supposed to do.

Set both the long and short title of the window.  § 

wmctrl -r "KTorrent" -T "string"

notes:

• See [#N -N] for more info.
• I can't change the title back. This is the same problem as [#N -N].

Activate or deactivate the window manager's "showing the desktop" mode.  § 

Activate or deactivate window manager's "showing the desktop" mode. Many window managers do not implement this mode.

wmctrl -k on 
wmctrl -k off

notes:

• doesn't work for me.

Change the viewport for the current desktop.  § 

Change the viewport for the current desktop. The X and Y values are separated with a comma. They define the top left corner of the viewport. The window manager may ignore the request.

wmctrl -o 1024,768

notes:

• This is ignored.

Change the number of desktops.  § 

Change number of desktops. The window manager may ignore the request.

Learn how many desktops you have:

$ wmctrl [#d -d] 
0  * DG: 1920x1200  VP: 0,0  WA: 0,0 1920x1200 
1  - DG: 1920x1200  VP: N/A  WA: 0,0 1920x1200 
2  - DG: 1920x1200  VP: N/A  WA: 0,0 1920x1200 
3  - DG: 1920x1200  VP: N/A  WA: 0,0 1920x1200 

wmctrl -n 1

Now check again:

$ wmctrl [#d -d] 
0  * DG: 1920x1200  VP: 0,0  WA: 0,0 1920x1200 
1  - DG: 1920x1200  VP: N/A  WA: 0,0 1920x1200

notes:

• This programmer begins counting at 0. So '1' means '2 desktops'
• Blackbox 0.70.1 and bbkeys 0.9.0 won't really honour this. It'll set it so that -d displays the 'correct' number of desktops, but my hotkeys to change desktops will still work. So it looks like bbkeys doesn't respect wmctrl's setting or Blackbox isn't honouring wmctrl's setting.

Change the geometry of all desktops.  § 

Change geometry (common size) of all desktops. The window manager may ignore the request.

wmctrl -g 1024,768

notes:

• Blackbox ignores this request.

Print help.  § 

wmctrl -h

Options and misc.  § 

--version

real-world examples  § 

Issues  §