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
Which of the following steps prevents a user from obtaining an interactive login session?
Running the command chsh -s /bin/false with the user name will change the user's login shell to /bin/false, which is a program that does nothing and returns a non-zero exit code. This means that the user will not be able to execute any commands or start an interactive shell session. This is a common way to disable a user's login without disabling the account completely, which can be useful for users who only need to access the system via scp, sftp, or other non-interactive services.However, this method does not prevent the user from authenticating with the system, and it may not work with some services that do not rely on the login shell, such as ssh with a forced command. Therefore, it is not a foolproof way to secure the system from unauthorized access.
1234
Which file specifies the user accounts that can NOT submit jobs via at or batch? (Provide the full path and filename)
The /etc/at.deny file specifies the user accounts that can NOT submit jobs via at or batch. The format of the file is a list of usernames, one on each line. Whitespace is not permitted. The superuser may always use at. If the file /etc/at.allow exists, only usernames mentioned in it are allowed to use at. If /etc/at.allow does not exist, /etc/at.deny is checked12. The at and batch commands use the files /usr/lib/cron/at.allow and /usr/lib/cron/at.deny to restrict usage on some systems3.
at.allow(5) - Linux man page at.deny(5) [linux man page] - The UNIX and Linux ForumsThe at.allow and at.deny files - IBM
Which character in the password field of /etc/passwd is used to indicate that the encrypted password is stored in /etc/shadow?
Answer(s): D
The password field of /etc/passwd is used to store the user's encrypted password or a special character that indicates how the password is stored. In older Linux systems, the user's encrypted password was stored in the /etc/passwd file. On most modern systems, this field is set to x, and the user password is stored in the /etc/shadow file12. The /etc/shadow file is more secure than the /etc/passwd file because it is readable only by the root user and not by regular users1. The other options are not valid characters for the password field of /etc/passwd.
Understanding the /etc/passwd File | LinuxizeUnderstanding the /etc/passwd File - GeeksforGeeks
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