# Main Index: Debian Linux Magic Spells Cheat Sheet (one liners, how to, tips and tricks)
# Commands for the GUI (Graphical User Interface)
You can check if and which Display Manager is present on the system by checking whether is present a symbolic link to the display manager file
ls -l /etc/systemd/system/display-manager.service
If the file is missing ("No such file or directory") there is no display manager (on the system there is therefore only the textual interface), otherwise the linked file is shown.
Or, you can read the file default-display-manager:
To change Display Manager, deactivate the current one and activate the new one (which must have been previously installed):
systemctl disable OLD_DISPLAY_MANAGER # For example systemctl disable sddm
systemctl enable NEW_DISPLAY_MANAGER # For example systemctl enable kdm (provided it has already been installed)
You can also use the following command, but it will open a box where you have to confirm your choice and press Enter.
dpkg-reconfigure DISPLAY_MANAGER # choose the DISPLAY_MANAGER you want to set in your system, for example: dpkg-reconfigure kdm
System users are stored in the /etc/passwd file and their passwords (shadowed) in /etc/shadow . Debian makes regular backups in /var/backups/passwd.bak and /var/backups/shadow.bak
Display Server (Window Manager)
update-alternatives --list x-window-manager # List Display Servers (Window Managers) installed on the system
echo $XDG_SESSION_TYPE # Show the Display Server currently in use.
echo $DESKTOP_SESSION shows the path and the name of the file (without the .desktop extension) containing information about the Desktop Environment to be started.
ls /usr/share/applications/ shows all launcher files for applications (which will appear in the desktop environment start menu). The files have a .desktop extension. A .desktop file contains the parameters to launch the application from the menu. The path and name of the file to be launched are indicated in the Exec parameter within the .desktop file. Application icons are placed in the section (or sections) of the menu specified under Categories.
xwinifo # Enter this command and then click on any window to get information about it, such as its size in pixels and color depth. You may also click on the desktop.
sudo rm -rf ~/.local/share/Trash/files/* # Empty trashcan
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Page issued on 25-Sep-2022 06:10 GMT