One of the things I appreciate about Linux versus winblowze is that almost everything can be managed and configured from the command line. That means that almost everything can be configured remotely via an SSH login connection. Sometimes it takes a bit of time spent on Internet searches but if you can think of it, it can probably be done from the command line.
Fixing my problem
Sometimes it is necessary to make remote modifications to a desktop using the command line. In this particular case I needed to reduce the number of workspaces on the Xfce panel from 4 to 3 at the request of the user. This is actually easy and only required about 20 minutes of searching on the Internet.
The default workspace count and many other defaults for xfwm4 can be found and changed in the /usr/share/xfwm4/defaults file. So setting “workspace_count=4” to “workspace_count=2” changes the default for all users on the host. The xfconf-query command can be used to query and set various attributes for the xfwm4 window manager. It should be used by the user account that requires the change and not by root.
In the sample below I have first verified the current setting of 4 workspaces, then set the number to 2, and finally verified the new setting.
[user@test1 ~]# xfconf-query -c xfwm4 -p /general/workspace_count 4 [user@test1 ~]# xfconf-query -c xfwm4 -p /general/workspace_count -s 2 [user@test1 ~]# xfconf-query -c xfwm4 -p /general/workspace_count 2 [user@test1 ~]#
This change takes place immediately and is visible to the user without a reboot or even logging out and back in.
So now that I had my problem fixed, I decided to explore the xfconf-query command in a bit more detail. Unfortunately there are no man or info pages for this tool nor is there any documentation in /usr/share. The usual fallback resulted in a little help information.
$ xfconf-query -h Usage: xfconf-query [OPTION…] - Xfconf commandline utility Help Options: -h, --help Show help options Application Options: -V, --version Version information -c, --channel The channel to query/modify -p, --property The property to query/modify -s, --set The new value to set for the property -l, --list List properties (or channels if -c is not specified) -v, --verbose Verbose output -n, --create Create a new property if it does not already exist -t, --type Specify the property value type -r, --reset Reset property -R, --recursive Recursive (use with -r) -a, --force-array Force array even if only one element -T, --toggle Invert an existing boolean property -m, --monitor Monitor a channel for property changes
This is not a lot of help but we can figure out a good bit from it anyway.
First, the channels are groupings of properties that can be modified. I made the change above to the “general” channel and the property is “workspace_count”. Let’s look at the complete list of channels.
$ xfconf-query -l Channels: xfwm4 xfce4-keyboard-shortcuts xfce4-notifyd xsettings xfdashboard thunar parole xfce4-panel xfce4-appfinder xfce4-settings-editor xfce4-power-manager xfce4-session keyboards displays keyboard-layout ristretto xfcethemer xfce4-desktop pointers xfce4-settings-manager xfce4-mixer
The properties for a given channel can also be viewed using the following syntax. I have used the less pager because the result is a long stream of data. I have pruned the listing below but left enough that you can see the type of entries you can expect to find.
$ xfconf-query -c xfwm4 -l | less /general/activate_action /general/borderless_maximize /general/box_move /general/box_resize /general/button_layout /general/button_offset <SNIP> /general/workspace_count /general/workspace_names /general/wrap_cycle /general/wrap_layout /general/wrap_resistance /general/wrap_windows /general/wrap_workspaces /general/zoom_desktop (END)
You can explore all the channels in this manner. I discovered that the channels generally correspond to the various settings in the Settings Manager. The properties are the ones that you would set in those dialogs. Note that not all the icons you will find in the Settings Manager dialog window are part of the Xfce desktop so there would be no corresponding channel for them. The Screensaver is one example because it is a generic screensaver and not unique to Xfce. The Settings Manager is just a good central place for Xfce to locate these configuration tools.
I did find a lot of incorrect and poorly documented information on the Internet. The best documentation for Xfce4 is on the Xfce website.