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>The XFree86 configuration files
Once we have been introduced to the general philosophy of the X Window System, it is time to take a closer look at the XFree86 implementation, which is the one that Linux has been using since the very beginning.
XFree86 is actually a collection of different servers, each one of them specifically developed [...]
Architecture of the X Window System
The X Window System has a networked architecture based on the traditional client-server model which differentiates it so much from other GUI approaches such as the ones used by Windows or Apple operating systems. The X server is the program that provides the display capability, running on a computer [...]
Sometimes you may need to know whether a certain module was successfully loaded into the kernel. Just enter the /sbin/lsmod command, which will show which modules are currently loaded. I recently needed to use this command to troubleshoot a problem with my network card in a Caldera distribution. [...]
The shutdown command is such run-of-the-mill command that most of us don\’t even realize that there are several options that you can pass to it to make it more useful. Aside from the well known -h to halt and -r to reboot, here are some other interesting options:
-c: cancel an already running shutdown process
-f: [...]
In order to increase the security of the system, you may want to limit which ttys will allow root to log in. This information is kept in the /etc/securetty file.
If you ever need to know what your environment variables are set up to, just enter the env or set command without any arguments. That will display a list of all your environment variables.
To quickly change run levels (eg 5 [X] to 1 [single user mode]), use the telinit command, followed by the run level you wish to change to. Standard run levels are :
0 – Halt
1, s, S – Single User Mode
5 – X
6 – Reboot
You may also wish to modify [...]
Well, it happens to even the best of the system administrators. Or perhaps the system administrator in your company quit his or her job and did not tell anyone what the password is. But not everything is lost. You can still fix the problem by following these steps:
Reboot the system (you may [...]
This is an eternal problem for people who use Linux at home, and would like their partners or kids to be able to at least shutdown the system but without giving them root access to the box. This question shows up in the mailing lists all the time. Well, Red Hat includes a [...]
Starting with the 6.0 version, the Red Hat distribution includes a new tool that automatically detects new hardware. This new tool, called kudzu runs at startup and maintains all the information in a database located in /etc/sysconfig/hwconf. If you add new hardware, kudzu should detect it, realize that it is not in the [...]