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Notice: Undefined index: p in /home/keeline/public_html/iteachphp/index.php on line 109 Deprecated: Function eregi() is deprecated in /home/keeline/public_html/iteachphp/index.php on line 124 Deprecated: Function eregi() is deprecated in /home/keeline/public_html/iteachphp/index.php on line 124 Linux BasicsWhat is Linux?Linux is a free open-source multi-user multi-threaded operating system with excellent reliability and security. It is based on Unix and in most respects is considered to work like Unix. The core part of the operating system was created by Linus Torvalds, a Finnish computer science student, in the mid-1990s. He was looking for a way to learn Unix system administration and other versions of Unix work-alikes, such as Minnix, did not suit his requirements. What is Open Source Software?Linux and the Unix-like utilities used with it are generally distributed under a licence created by Richard Stallman and the the Free Software Foundation (http://www.fsf.org) called the GNU General Public License or GPL. This license has several interesting features.
How is the Linux filesystem arranged?Since Linux is based on Unix, it is not surprising that its filesystem is also based on Unix. The following directories are commonly found on Linux systems and some commentary is provided about their typical content:
What is the boot sequence for Linux?When a machine is first turned on, it performs a power-on self-test (POST) which checks for memory and key devices. The hardware then looks at the first boot device (CD-ROM, floppy, first hard drive) for bootable software. If this is the first hard drive, it looks in a special sector called the Master Boot Record (MBR) for information on the way the drive is partitioned and a boot loader which tells it where bootable software may be found.
On most Linux systems, the common boot loaders are
After the Linux kernel is loaded (
After the run level is identified, symbolic links to files in /etc/rc.d/init.d from /etc/rc.d/rcX.d (where X is
the run level number) are executed in alphabetical order to start or stop
(kill) server programs. The ntsysv program is helpful to
specify which programs are turned on at boot.
The final file to be processed is What are some common Linux commands?Linux commands are generally similar to or identical to Unix commands. Here are some useful ones which you may want to look at.
Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/keeline/public_html/iteachphp/index.php on line 130
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