What is the purpose of the Sticky Keys feature in X?
Answer(s): A
The Sticky Keys feature in X is an accessibility option that allows users to press modifier keys (such as Ctrl, Alt, Shift, or the Windows key) one at a time, instead of holding them down simultaneously, to perform keyboard shortcuts. For example, to copy something, a user can press Ctrl, release it, and then press C, instead of pressing Ctrl+C together. This can be helpful for users who have difficulty pressing multiple keys at once, or who prefer not to do so.
https://www.howtogeek.com/739764/how-to-turn-off-sticky-keys-on-windows-10/ https://geekflare.com/using-sticky-keys-in-windows/
Why is the xhost program considered dangerous to use?
Answer(s): B
The xhost program is used to add and delete host names or user names to the list allowed to make connections to the X server1. In the case of hosts, this provides a rudimentary form of privacy control and security. It is only sufficient for a workstation (single user) environment, although it does limit the worst abuses1. However, if xhost is used to grant access to everyone, even if they aren't on the list (i.e., access control is turned off), then any user on the network can connect to your X server and monitor your keystrokes, capture your screen, or run malicious programs2. This is why xhost is considered dangerous to use and should be avoided in favor of more secure methods, such as xauth or ssh23.
xhost linux command man page - commandlinux.comLinux Xhost Command Help and Examples - Computer Hope xhost(1) -- Arch manual pages
An administrator wants to determine the geometry of a particular window in X, so she issues the __________ -metric command and then clicks on the window.
The xwininfo command is a utility for displaying information about windows in X. It can show various attributes of a window, such as its location, size, depth, border width, visual class, colormap, map state, and event masks. The -metric option specifies that all dimensions should be displayed in metric units (millimeters) rather than pixels. By issuing the xwininfo -metric command and then clicking on a window, the administrator can determine the geometry of that window, including the decorations, in millimeters.
xwininfo(1) -- Arch manual pages[command line -
On a system running the KDE Display Manager, when is the /etc/kde4/kdm/Xreset script automatically executed?
The /etc/kde4/kdm/Xreset script is a script that runs as root after a user's X session exits. It can be used to perform some cleanup tasks or other actions that need to be done when the user logs out of the graphical environment. For example, it can reassign the ownership of the console to root, or shut down the system if desired. The /etc/kde4/kdm/Xreset script is part of the KDE Display Manager (kdm), which is a graphical login manager for X. KDM can be configured to run this script by setting the Reset key in the [X-*-Core] section of the /etc/kde4/kdm/kdmrc configuration file.
kdm.options - configuration options for X display manager kdm(1) -- kdm -- Debian jessie -- Debian Manpages debian - How to get system to shutdown when Xorg is quit? - Unix ...
Which of the following lines is an example of a correct setting for the DISPLAY environment variable?
The correct format for the DISPLAY environment variable is hostname:displaynumber.screennumber, where hostname is the name of the computer where the X server runs, displaynumber is a sequence number (usually 0) that identifies a display, and screennumber is the number of the screen within that display (usually 0). The screennumber can be omitted if it is 0. For example, localhost:0 or myhost:1.0 are valid values for the DISPLAY variable. The other options are either missing the colon, using the wrong separator, or not specifying the display number.
X11 - DISPLAY (environment variable) - Datacadamia x11 - How can I specify a display? - Stack OverflowWhat is the $DISPLAY environment variable? - Ask Ubuntu
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