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Is there a simple linux command that will tell me what my display manager is?

I'm using Xfce. Are different desktop environments usually affiliated with different display managers?

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13 Answers 13

85

Unfortunately the configuration differs for each distribution:

Debian/Ubuntu

/etc/X11/default-display-manager

RedHat (should also apply to Fedora)

/etc/sysconfig/desktop

OpenSuSe

/etc/sysconfig/displaymanager
11
  • 1
    Huh, why are you telling me about configuration...?
    – ptrcao
    Sep 9, 2011 at 15:49
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    @ptrcao Because it specifies what display manager you are using. Sep 9, 2011 at 15:51
  • 3
    Suppose I don't know what my display manager is and I want to find out by using terminal. How would I do that?
    – ptrcao
    Sep 9, 2011 at 15:55
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    @ptrcao You would look into those files. Either opening them in your favorite editor, or just doing cat. Sep 9, 2011 at 15:56
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    It has only one line in it: /usr/bin/xdm - does that mean xdm is my display manager?
    – ptrcao
    Sep 9, 2011 at 15:59
58

If you are using systemd based distribution. This command will give the name of the display manger currently configured because you may have more than one display manager installed.

grep 'ExecStart=' /etc/systemd/system/display-manager.service

OUTPUT will be something like

ExecStart=/usr/bin/mdm

Looks like I am using mint display manager.

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  • 1
    This answer should be the first you see, as most users having this type of question today are running systemd based distros. Thanks. It helped me.
    – Adergaard
    Feb 14, 2017 at 19:24
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    @allsyed my file doesn't have /usr/bin it has /usr/sbin. Linux-Mint 18
    – Prvt_Yadav
    May 18, 2018 at 12:21
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    This answer works on Arch Linux. Thanks
    – imriss
    Jun 19, 2018 at 15:55
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    In my case (Centos 7) I've to write | grep '/usr/sbin'
    – Davide
    Sep 27, 2018 at 13:54
  • @Davide I've edited the search pattern in the answer to match both cases. Jul 22, 2019 at 12:33
43

If you're using systemd, then

systemctl status display-manager

Will display the name and status of the active display manager service on your machine.

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  • With Debian 9, this is the only one that worked for me. The other systemd methods returned nothing. Jul 3, 2019 at 17:42
  • Doesn't work on Crostini.
    – gcdev
    Jan 20, 2021 at 21:55
30

There isn't. The display manager is not necessarily related to anything else that's running on the same X server. The display manager runs before you log in; it's chosen by the system administrator. Everything else (window manager, session manager, desktop environment, …) is chosen by the user. There doesn't even have to be a display manager: if you log in in text mode and start the GUI with startx, no display manager is involved.

You can check which display manager is the default one on your system. This will only give the right answer under some common but not universal assumptions. If you manually ran a different manager for whatever reason, this method won't tell you.

A good bet is to find out the process ID of the X server: its parent process is probably a display manager, if there is one. This requires that your clients are running on the same machine as the X server. lsof /tmp/.X11-unix/X${DISPLAY#:} will show the X server process (assuming the X sockets live in /tmp/.X11-unix).

x=$(lsof -F '' /tmp/.X11-unix/X0); x=${x#p}
ps -p $(ps -o ppid -p $x)

(Explanation: lsof -F '' prints output like p1234. The -F option means a machine-parseable output format, and '' means to only print the PID, with the letter p before it. x=${x#p} strips off the initial letter p. The last line obtains the PID of the parent of the X server (ps -o ppid -p $x), and calls ps to show information about that parent process.)

Some distributions allow installing multiple display managers. There'll only be a single one running unless you have a multiseat system though. To list all installed display manager packages under Debian and derivatives:

aptitude -F %p search '~i ~P^x-display-manager$'

or

</var/lib/dpkg/status awk '
    /^Package: / {package = $2}
    /^Provides: .*x-display-manager/ {print package}'
0
14

The display manager name should be in DESKTOP_SESSION

echo $DESKTOP_SESSION

returns "gnome" for me.

EDIT
You're right. They're going back and forth on that on XFCEs bugzilla so it probably isn't very reliable.

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  • @frabjous: What about gdm and kdm? Are they display managers too or just login managers?
    – ptrcao
    Sep 9, 2011 at 14:39
  • I must've accidentally deleted frabjous' comment just above because I remember he remarked that Gnome is a desktop environment, not a display manager. This thread is abound with confusion...
    – ptrcao
    Sep 9, 2011 at 15:48
  • This gives information about… the desktop session, which is likely to be the same thing as your desktop environment, but may be something else altogether if you're not using a desktop environment or you have a peculiar configuration. On the machine where I'm writing this, $DESKTOP_SESSION is unknown. Sep 9, 2011 at 23:56
  • +1, echo $DESKTOP_SESSION also returns gnome to me... but maybe this only works for gnome? Sep 17, 2011 at 22:37
  • If it only works for gnome, this command will only help you deduce "yes you have Gnome or no you don't have gnome". When the question wants to find out more than that. Sep 17, 2011 at 22:37
4

Like @Gilles said, the display manager will start your desktop environment.

According to the Debian Wiki, mostly these end with dm, only exception is slim.

So this should suffice for most of people's needs:

ps auxf | awk '{print $11}' | \grep --color -e dm$ -e slim$

Or to be sure, it exists as a parent process, and is not forked (except from the init system):

ps auxf | awk '{print $11}' | \grep -e "^/.*dm$" -e "/.*slim$" 
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  • 1
    This is the only solution here that worked for me. Figured out that my Fedora 23 minimal with LXDE add-on (not the LXDE Spin) is running lightdm. The RedHat/Fedora solution from the top answer didn't work, the configuration seems to have moved. Feb 7, 2016 at 14:29
  • Returned nothing on Crostini.
    – gcdev
    Jan 20, 2021 at 22:02
  • Crostini? Are you sure that is it Linux? Or that is it running an X server? Display managers need X server to work. Apr 2 at 19:29
2

Try using this command

systemctl |grep "Display Manager"

This will provide below output.

[anil@localhost Desktop]$ systemctl |grep "Display Manager" xdm.service loaded active running X11 Display Manager

Now you can see xdm.service listed just above loaded active running and that is your Display Manager

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  • Returned nothing on Crostini.
    – gcdev
    Jan 20, 2021 at 22:03
2

After you enable the display-manager.service, a symlinked file to the specified or default display manager in use -- as you might have multiple one on the same desktop environment -- should be at /etc/systemd/system/display-manager.service

file /etc/systemd/system/display-manager.service

This method reliably worked out for me on ubuntu-20 LTS.

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You can do this via a third-party script called screenfetch

Screenfetch is a bash script available for Linux that displays system information alongside the ASCII version of the Linux distribution Logo of the system

Install via package manager sudo apt-get install screenfetch (assuming you're on Debian variants)

and just run screenfetch In your terminal

Project link https://github.com/KittyKatt/screenFetch

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  • This works on Crostini. Crostini apparently uses Sommelier.
    – gcdev
    Jan 21, 2021 at 16:42
1

Another systemd approach.

This one uses the show command to filter out a property of the display-manager service:

➜ systemctl --property=Id,Description show display-manager.service
Id=sddm.service
Description=Simple Desktop Display Manager
0

In some case, wmctrl could help. This utility is compatible with a lot of windows managers.

wmcrt -m 

should display the name of the currently used window manager.

1
0

As already mentioned, there is a lot of confusion in this thread. The original question is what display manager, not desktop manager or window manager. I'm currently running Xfwm4 which is Xfce window manager, and lxdm which is lightweight X11 display manager (from LXDE, not Xfce). You should be able to see what display manager you are using via htop. You've probably long since discovered the answer over the past 4 years :)

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  • Actually never did... In fact gave up on Linux altogether and went over to the dark side :D
    – ptrcao
    Feb 22, 2018 at 13:37
-3
lshw -c video | grep 'configuration'
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    A little bit of explanation would be nice.
    – phk
    Aug 1, 2018 at 12:10
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    A very misleading answer. I wonder why the writer hasn't removed it yet. Feb 7, 2020 at 18:05
  • Hey! This shows only the drivers (modules) we are using to render the screen (show X). There is nothing to do with display managers! Apr 2 at 19:25

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