[xubuntu-users] I still have the black rectangle on my desktop.

Victor Forberger vforberger at fastmail.fm
Tue Sep 30 14:01:59 UTC 2014

On 09/30/2014 08:26 AM, George DiceGeorge wrote:
> Easiest way to do a screen shot is...
> to take a photo with your phone!
> [g]
> *From:* Robert Streeter <mailto:rstreeter78 at gmail.com>
> *Sent:* Tuesday, 30 September, 2014 13:59
> *To:* lutz.andersohn at gmail.com <mailto:lutz.andersohn at gmail.com> ;
> Xubuntu Support and User Discussions
> <mailto:xubuntu-users at lists.ubuntu.com>
> *Subject:* Re: [xubuntu-users] I still have the black rectangle on my
> desktop.
> Can you upload a screenshot of the rectangle. Please.
> On Sep 30, 2014 7:34 AM, "Lutz Andersohn" <landersohn at gmail.com
> <mailto:landersohn at gmail.com>> wrote:
>     The xfce4-panel is sort of similar to what you know from Windows as
>     status bar. Do you have a bar at the bottom with some icons on it? At
>     the top?
>     You can do a right clock on it and click "Settings" (may be
>     "preferences") and see how many panels you have. You probably want to
>     keep panel 0. If you have a panel 1 (drop down list up top in the
>     settings dialog), you can probably delete it.
>     On 09/30/2014 03:11 AM, David Walland wrote:
>     > Hi,
>     >
>     > I ran *ps -A | grep $(xprop _NET_WM_PID | cut -d' ' -f3)*
>     >
>     > and this is what I get:
>     >
>     > 2264 ?        00:00:00 xfce4-panel
>     >
>     > 2264 is output in red.
>     >
>     > I'm still so new to Linux, I have no idea either why running those
>     > commands gets that information, nor what the information means, except
>     > in the vaguest sense.  While I'd love to remove the black rectangle,
>     > I'd love even more to understand how it happened and how the command
>     > to get that information works and now how to use the info to get rid
>     > of it.
>     >
>     > I'm still one of the Rikki-Tikki-Tavi sort...
>     >
>     > Regards,
>     >
>     > David
>     >
>     > On 29 September 2014 17:48, m. neasae <mlnease at hctc.com
>     <mailto:mlnease at hctc.com>
>     > <mailto:mlnease at hctc.com <mailto:mlnease at hctc.com>>> wrote:
>     >
>     >     To identify it, in a terminal run:
>     >
>     >     ps -A | grep $(xprop _NET_WM_PID | cut -d' ' -f3)
>     >
>     >     ...then click on the square.
>     >
>     >     Assuming its an X11 window, this command will grab the pid of the
>     >     window using xprop and pull out the associated application process
>     >     info using ps.
>     >
>     >     On 09/29/2014 04:16 AM, xubuntu-users-request at lists.ubuntu.com
>     <mailto:xubuntu-users-request at lists.ubuntu.com>
>     >     <mailto:xubuntu-users-request at lists.ubuntu.com
>     <mailto:xubuntu-users-request at lists.ubuntu.com>> wrote:
>     >
>     >         I still have the black rectangle on my desktop.
>     >
>     >

Yes, you have a panel without any items in it.  A panel in xfce is akin
to the dock on Macs or the Start Bar in Windows.

Right-click on the rectangle and select Panel Preferences. A dialog box
will appear with a menu at the top for selecting all the running panels
(more than one panel can run at the same time).  For each panel, you can
adjust the display settings, the appearance, and the items included in
that panel. Note that only one panel can include the notifications area
item.  Go to http://xfce.org/ for descriptions of panels and all things

To see the variety of how panels can be used, check out


where I have pics of the two desktops I run.  For one desktop, I have
two panels running -- one across the top and a second on the right
bottom corner.  On my other desktop, I have just one panel running from
the right bottom corner.

The command you ran to get this info is pretty nifty terminal command
that pipes (the | symbol) one command's output as the input into another
command.  In the command you ran, ps is piped into grep which is then
piped into cut.  Tomes have been written about ps and grep and probably
cut too, so I'll leave the explanation of these commands to others.

A good way to find basic info about a terminal command is to type the
command followed with --help, such as:

	grep --help

Another option for finding out about a command is to read the man page
(man is short for manual) by typing:

	man ps

Good luck,

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