Linux User Interfaces and Desktops
The Linux+ certification exam from CompTIA covers the topic of user interfaces and desktops. This table shows the subtopics, weights, descriptions, and key knowledge areas for this topic.
|Install and configure X11||2||Be able to install and configure X11||Basic understanding of X Window configuration|
|Set up a display manager||2||Set up and customize a display manager||Work with XDM (X Display Manager), GDM (Gnome Display Manager),
and KDM (KDE Display Manager)
|Accessibility||1||Knowledge and awareness of accessibility technologies||Assistive Technology (ATs) and keyboard settings|
To adequately address these topics, focus on the following files, terms, and utilities: /etc/initab, /etc/x11/xorg.conf, braille display, DISPLAY, emacspeak, gdm configuration files, gestures, GOK, high contrast desktop themes, kdm configuration files, large screen desktop themes, mouse keys, on-screen reader, orca, screen magnifier, screen reader, slow/bounce/toggle keys, sticky/repeat keys, X, xdm configuration files, xdpyinfo, xhost, xwininfo.
Here are the top ten items to know as you study for this domain:
The emacspeak speech interface is one of the most popular speech interfaces available for Linux.
The xdpyinfo utility can be used to view information about an X server. It can be used with the all option to see information about all the extensions supported by the server.
Window information for X can be viewed with the xwininfo utility. Using the -all option shows all the possible information.
The server access-control program for X is xhost. This is used to connect to a host across the network and work within the graphical interface.
The X Display Manager (xdm) is the default display manager included with the X Window System.
The /etc/x11/xorg.conf file is the X configuration file used for initial setup.
Several assistive technology projects have been developed for both KDE (the KDE Accessibility Project) and GNOME (the GNOME Accessibility Projects).
Orca is a screen reader from the GNOME project intended to help individuals who are blind or impaired. Orca will work with Firefox, Thunderbird, OpenOffice.org/LibreOffice, and other applications.
The GNOME onscreen keyboard reader (GOK) is another assistive technology. It works with XML files and can dynamically create keyboards to adapt to a user’s needs.
Slow keys can be configured for a keyboard preference to accept input only if a key is held; this prevents accidental presses from counting as input. Bounce keys can be configured to ignore fast duplicate key presses; sticky keys can be used to simulate simultaneous key presses.