The X window system (commonly X Window System or X11, based on its current major version being 11) is a computer software system and network protocol that provides a basis for graphical user interfaces (GUI) for networked computers.

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Open a window on a remote X display (why “Cannot open display”)?

Once upon a time, DISPLAY=:0.0 totem /path/to/movie.avi after ssh 'ing into my desktop from my laptop would cause totem to play movie.avi on my desktop. Now it gives the error: No protocol ...
28
votes
1answer
3k views

How do keyboard input and text output work?

Suppose I press the A key in a text editor and this inserts the character a in the document and displays it on the screen. I know the editor application isn't directly communicating with the hardware ...
14
votes
2answers
1k views

Manipulating X key and pointer grabs on the command line

What command line tools exist to list and manage X server grabs? (That's grab as in key and pointer grabs, i.e. restricting the use of a particular key or mouse button to a particular application, or ...
29
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5answers
7k views

What process created this X11 window?

Given an X11 window ID, is there a way to find the ID of the process that created it? Of course this isn't always possible, for example if the window came over a TCP connection. For that case I'd ...
16
votes
3answers
4k views

Reattach to lost X11 session

I'm using X11 forwarding over ssh to run Linux apps on my Windows box, and when the network drops it loses everything that was running. Is there anything similar to screen for X11?
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votes
2answers
936 views

Share the clipboard between bash and X11

In this thread the top answer shows how to copy text that has been previously selected with the mouse on a gnome-terminal, to the clipboard in X11. My question is: Say I copy a piece of text from the ...
17
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1answer
1k views

Shortcut keys that are independent to keyboard layout

Is there a way to define an association of a particular physical key of the keyboard to some action, independently of the letter that this key is associated to in any layout? Example: In most ...
26
votes
4answers
25k views

What is “.xsession” for?

What is the purpose of the .xsession file in the home folder? What should be put in there? The desktop environments don't use that file and for the X startup from the tty there is .xinitrc.
4
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1answer
2k views

How to get all my keys to send keycodes

I'm using Gentoo with XFCE. I have a logitech K350 keyboard, all but a few of the keys work as expected but there is one specific key that I want to use but when I run showkey no key codes are being ...
4
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2answers
18k views

Cannot connect to X server :0.0 as superuser

When I am online, I get following error and the tool does not start: [root@dhcppc9 lin64]# ./ise No protocol specified _pn: cannot connect to X server :0.0 But everything is OK when I am not a ...
6
votes
2answers
738 views

Isn't $HOME supposed to be the location of the user's home directory?

I'm having trouble with a web application I'm writing: The web application, which runs as user nobody, needs to launch an inkscape process to manipulate some SVG files. Because this runs as user ...
23
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4answers
18k views

How to speed up X over SSH on a slow network connection?

Are there any specific recommendations on speeding up X applications over ssh on a slow network connection? In this specific case, I am accessing a server located in west coast from a laptop in east ...
12
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2answers
2k views

Record every keystroke and store in a file

I need to record every keystroke and store in a file in the user directory ~, when using my account, I am not sudoer and I cannot install programs (like logKeys) in any way. How could I do so using ...
9
votes
2answers
9k views

Make mouse movements scroll when the middle button is held down

In Windows, I'm used to clicking the center button and it offering a "fast scroll" option up or down. How can I get this behavior on Linux? It currently seems to use the back button upon center click ...
6
votes
1answer
9k views

X11 forwarding an OpenGL application from a machine running an NVIDIA card to a machine with an AMD card

I'm interested in forwarding an X11 session over SSH, in order to launch a remote process that utilizes OpenGL (specifically, gazebo for anyone familiar.) The problem that I seem to be running into ...
5
votes
1answer
516 views

How to maximize a window programmably in X Window?

I'm wondering if there is any commands or programs to make some window maximized in X Window? For example, what I imagine is something like this xmaximize -window *window_id*
5
votes
2answers
9k views

How to start a second X session?

I tried to do it with the command startx 1. It seemed to flicker to a different screen momentarily, but then exited. Got the following error: /usr/bin/xterm: No absolute path found for shell: :1 ...
7
votes
4answers
7k views

How to send keystrokes (F5) from terminal to a process?

I'm using an Raspberry Pi in combination with Chromium (kiosk mode) to show up some stats. The Pi doesn't have an connected keyboard so I searched for a solution to send keystrokes from the terminal ...
6
votes
3answers
395 views

Tuning keyboard (dead key) functionality in X

My preferred keyboard configuration is US-International. When I use it on MS-Windows and type certain special characters (i.e., ~ ' ") followed by a, o n I get á ó or ñ as I wish. However when I type ...
1
vote
1answer
807 views

unlisted screen resolution

on my new computer I have 2 screens connected on the igpu of a i7 processor, 1 using hdmi. the other using dvi. Both screens are the same but 1 has a wrong resolution inside X, and it can't be ...
10
votes
3answers
14k views

Why does my X11 forwarding attempt fail with “connect /tmp/.X11-unix/X0: No such file or directory”?

On my local machine, I run: ssh -X me@remotemachine.com (For completeness, I have also tested all of the following using -Y with identical results). As expected, this accesses remotemachine.com ...
1
vote
1answer
97 views

Remapping Caps Lock to Compose

Because I now and then need to use scandinavian letters despite using US Dvorak as my layout, I would like to use Caps Lock as a compose key. (I don't need Caps Lock at all, I'm not a forum troll) ...
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vote
3answers
2k views

startx autologin does not run in /etc/inittab in after Debian Jessie update

I installed a minimal Debian system (stable) without GUI, switched to testing/jessie to be able to get the Cinnamon desktop, but X didn't start on boot. If I log in as myself at the CLI, I can type ...
9
votes
2answers
2k views

Is there a way to simulate a “Close” event on various windows using the terminal?

I answered on Ask Ubuntu Quit all instances of gnome-terminal via a command but as you all can read gnome-terminal didn't seems to have a SIGcall I could use to simulate this "Close" event. So this ...
29
votes
6answers
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How to get keycodes for xmodmap?

I'm trying to use xmodmap to remap Alt / Super keys on Dell L100 keyboard, and have trouble getting the keycodes. For instance, using xev doesn't give me keycode for Alt FocusOut event, serial 36, ...
12
votes
3answers
4k views

Copy file to xclip and paste to Firefox

I'm coping file to xclip cat file.txt | xclip I'm pasting without problem with xclip -o When I want to paste it to Firefox with Ctrl+V it pastes old text (that shouldn't already be in the ...
11
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2answers
3k views

Detach/reattach an application run on X over SSH?

I have a development server that I leave running all the time, and a development laptop that I turn off/on everyday. I have a GUI application on the server that I'd like to run over SSH -X, and I'd ...
18
votes
4answers
8k views

Setting the window dimensions of a running application

I'm trying to start an application within Ubuntu (xfce or gnome) and via the command line and was wondering if there's a generic way to set the dimensions of a given window of a given app that is ...
16
votes
3answers
8k views

How do I find the window dimensions and position accurately including decorations?

I've been trying to figure out the size of a window for use in a small script. My current technique is using wmctrl -lG to find out the dimensions. However, the problem is this: The x and y figures ...
14
votes
4answers
11k views

How can I set mouse sensitivity, not just mouse acceleration?

I can't find a single desktop environment that supports setting both mouse acceleration AND mouse sensitivity. I don't want any mouse acceleration, but I want to increase the speed of my mouse. That ...
6
votes
2answers
154 views

Find out which application listens to specific key bindings? [duplicate]

Is there an application to know which key is bound by which process and therefore not usable in another application?
5
votes
3answers
262 views

Interacting with X applications programmatically

I have an application which is built using GTK+. The application has a very simple interface. When started, the same window always opens, with a few input controls. We want to write a script to fill ...
4
votes
3answers
450 views

How many clipboards are in system? [duplicate]

I was recently thrown there from the windows world and I'd like to ask some questions about clipboards in Linux (and Unix?) systems. What is X clipboard? How many clipboards are in Linux? Actually, ...
2
votes
1answer
20k views

Disabling graphical login in Debian wheezy

I have installed Debian wheezy on my machine with a netinst image, now I would like to deactivate the desktop and boot straight to the command line, not only that but I would like to not waste any ...
10
votes
4answers
4k views

Reassign Ctl and Alt keys - xmodmap error

I am attempting to remap my keyboard in order to make emacs usable. My ergonomic keyboard puts its single Control key in an isolated 4-key island way off to the left. The OS is Debian squeeze. Here ...
8
votes
2answers
871 views

Custom xkb layout in which one key creates two unicode code points

I am writing a new custom keyboard layout for Xorg, but there is one particular glyph which does not exist in Unicode. It is, however, easy to create it by using a standard letter plus a combining ...
4
votes
3answers
561 views

Screenshot of non active window

How to take a screen shot of non active window? If I have 2 windows, I want to capture the screenshot of the one which is running in the background.
8
votes
1answer
754 views

What's the difference between Primary Selection and Clipboard Buffer?

I am tweaking in Webkit-browser land in Linux and I come accross the terms "Primary Selection" and "Clipboard selection or buffer" very often. I want to understand what are they and what ...
4
votes
2answers
8k views

Accessing Linux server from Windows machine in graphical mode via SSH

I need to access one of my school Linux servers from my home computer that runs Windows. And I need to access graphical desktop (X server) on them remotely, not only shell. The problem includes 3 ...
4
votes
2answers
2k views

How to access X display from a cron job when using gdm3? [duplicate]

Possible Duplicate: Open a window on a remote X display (why “Cannot open display”)? I'm trying to run a cron job that needs access to my X session. I know my X session will ...
3
votes
2answers
806 views

Java doesn't show menu text

I startet netbeans/intelliJ/squirrelSQL after I didn't use it for a few days/weeks and now the menu doesn't show text. There are just the underlineds. My system: ArchLinux (everything up to date, ...
2
votes
1answer
168 views

Mapping key bindings

Background: I got an Acer Chromebook yesterday and I am running Ubuntu on it (I am also somewhat new to Linux). The keyboard does not have dedicated Home and End buttons since in ChromeOS there are ...
6
votes
4answers
43k views

X client forwarded over SSH “cannot open display: localhost:11.0”

I have enabled X forwarding on remote machine where SSH server is running: # grep -i forward /etc/ssh/sshd_config X11Forwarding yes # On local machine, I have started SSH client with -X flag ...
5
votes
2answers
6k views

How to configure xorg.conf for widescreen VNC on headless Linux/Ubuntu?

I have a Ubuntu 12.10 Box configured to run headless. I've managed to boot X headless by a lot of trial and error but I still have a glitch: When booting using the monitor, it all works ok, widescreen ...
4
votes
1answer
66 views

Transfer X from monitor to remote machine

I want to remote login to another laptop to continue working on session left over. VNC is slow because it's bandwith hog. I know (or I think I know) that it's not latency, it's bandwith because the ...
4
votes
2answers
515 views

Adding custom Compose key sequences

How can one add custom Compose-key sequences? I have googled quite a bit, but could not find an explanation. In particular, I would like to have: <Compose> + <Z> + <Z> = ℤ # ...
4
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1answer
2k views

How can I automatically disable my laptop's built-in keyboard in X.org?

Distro and X.org Version Information I am using Ubuntu 12.10 with xserver-xorg/quantal 1:7.7+1ubuntu4. Disabling Built-In Keyboard in X11 I have a laptop with a built-in keyboard that no longer ...
3
votes
1answer
140 views

After upgrade, X button in titlebar no longer closes xterm

In theory, pressing the close button should close an xterm. It did before I did an aptitude upgrade. (I'm running Debian testing). But now it doesn't—clicking the X does nothing—but only for some ...
2
votes
2answers
905 views

Why won't my X Server won't start as a regular user?

X won't start on my main machine. I can start it as root, but then it only logs me in as root -- I can't use my regular user account. When I start up, it flashes a black screen, then hangs at ...
1
vote
1answer
106 views

osx server, windows client, running emacs opens it on server not client

I've installed emacsformacosx on my OSX box. I'd like to shove my macmini in a data center and run it headless. I've gotten x-windows working. If I run xeyes, it displays on my Windows 7 client. ...