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Terminal devices are managed by your system using the getty program and a set of configuration files. When your system starts, it reads a list of connected terminals in the inittab file and then executes an appropriate getty program for each one, either mingetty, mgetty, or agetty. Such getty programs set up the communication between your Linux system and a specified terminal. mingetty provides minimal support for virtual consoles, whereas agetty provides enhanced support for terminal connections. agetty also includes parameters for the baud rate and timeout. mgetty is designed for fax/modem connections, letting you configure dialing, login, and fax parameters. mgetty configuration files are held in the /etc/mgetty+sendfax directory. Modem connection information is held in the /etc/mgetty+sendfax/ mgetty.config file. All getty programs can read an initial message placed in the /etc/issue file, which can contain special codes to provide the system name and current date and time.
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The /etc/inittab file holds instructions for your system on how to manage terminal devices. A line in the /etc/inittab file has four basic components: an ID, a runlevel, an action, and a process. Terminal devices are identified by ID numbers, beginning with 1 for the first device. The runlevel at which the terminal operates is usually 1. The action is usually respawn, which means to run the process continually. The process is a call to the mingetty, mgetty, or agetty with the terminal device name. The /etc/termcap file holds the specifications for different terminal types. These are the different types of terminals users could use to log in to your system. Your /etc/termcap file is already filled with specifications for most of the terminals currently produced. An entry in the /etc/termcap file consists of various names that can be used for a terminal separated by a pipe character (|) and then a series of parameter specifications, each ending in a colon. You find the name used for a specific terminal type here. You can use more to display your /etc/termcap file, and then use a search, /, to locate your terminal type. You can set many options for a terminal device. To change these options, use the stty command instead of changing configuration files directly. The stty command with no arguments lists the current setting of the terminal.
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When a user logs in, having the terminal device initialized using the tset command is helpful. Usually, the tset command is placed in the user s .bash_profile file and is automatically executed whenever the user logs in to the system. You use the tset command to set the terminal type and any other options the terminal device requires. A common entry of tset for a .bash_profile file follows. The -m dialup: option prompts the user to enter a terminal type. The type specified here is a default type that is displayed in parentheses. The user presses ENTER to choose the default. The prompt looks like this: TERM=(vt100) . eval 'tset -s -Q -m dialup: vt00'
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Input devices, such as mice and keyboards, are displayed on several levels. Initial configuration is performed during installation where you select the mouse and keyboard types. You can change that configuration with your administration configuration tools, such as redhat-config-mouse and redhat-config-keyboard (Mouse and Keyboard in the System Settings menu and window). Special configurations also exist for mice and keyboard for the X Window System, and for the KDE and Gnome desktops. You select the keyboard layout and language, as well as configure the speed and display of the mouse.
Installing Sound, Network, and Other Cards
To install a new card, your kernel must first be configured to support it. Support for most cards is provided in the form of modules that can be dynamically loaded into the kernel. Installing support for a card is usually a simple matter of loading a module that includes the drives for it. For example, drivers for the Sound Blaster sound card are in the module sb.o. Loading this module makes your sound card accessible to Linux. Most distributions automatically detect the cards installed on your system and load the needed modules. If you change sound cards, the new card is automatically detected by Kudzu, invoking redhat-config-soundcard to configure it. For network cards, Kudzu invokes redhat-config-network to perform the configuration. You could also load modules you need manually, removing an older conflicting one. The section Modules later in this chapter describes this process. Device files for most cards are already set up for you in the /dev directory. For example, the device name for your sound card is /dev/audio. The device names for network cards are aliases for network modules instead of device files. For example, the device name for your Ethernet card begins with eth, with the numbering starting from 0, as
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