FreeBSD, a direct descendant of AT&T UNIX, has a long and turbulent history dating back to 1993. Unlike Linux distributions, which are defined as integrated software solutions consisting of the Linux kernel and thousands of software applications, FreeBSD is a tightly integrated operating system built from a BSD kernel and the so-called “userland” (therefore usable even without extra applications). This distinction is largely lost once installed on an average computer system – like many Linux distributions, a large collection of easily installed, (mostly) open source applications are available for extending the FreeBSD core, but these are usually provided by third-party contributors and aren’t strictly part of FreeBSD.
FreeBSD has developed a reputation for being a fast, high-performance and extremely stable operating system, especially suitable for web serving and similar tasks. Many large web search engines and organisations with mission-critical computing infrastructures have deployed and used FreeBSD on their computer systems for years. Compared to Linux, FreeBSD is distributed under a much less restrictive license, which allows virtually unrestricted re-use and modification of the source code for any purpose. Even Apple’s Mac OS X is known to have been derived from BSD. Besides the core operating system, the project also provides over 15,000 software applications in binary and source code forms for easy installation on top of the core FreeBSD.
While FreeBSD can certainly be used as a desktop operating system, it doesn’t compare well with popular Linux distributions in this department. The text-mode system installer offers little in terms of hardware detection or system configuration, leaving much of the dirty work to the user in a post-installation setup. In terms of support for modern hardware, FreeBSD generally lags behind Linux, especially in supporting popular desktop and laptop gadgets, such as wireless network cards or digital cameras. Those users seeking to exploit the speed and stability of FreeBSD on a desktop or workstation should consider one of the available desktop FreeBSD projects, rather than FreeBSD itself.
FreeBSD 7.0 Screenshot
Launched in late 2003, CentOS is a community project with the goals of rebuilding the source code for Red Hat Enterprise Linux (RHEL) into an installable Linux distribution and to provide timely security updates for all included software packages. To put in more bluntly, CentOS is nothing more than a clone of RHEL. The only technical difference between the two is branding – CentOS replaces all Red Hat trademarks and logos with its own. But the connection between RHEL and CentOS is not immediately visible on the CentOS web site; due to trademark laws, Red Hat is referred to as a “Prominent North American Enterprise Linux Vendor”, instead of its proper name. Nevertheless, the relations between Red Hat and CentOS remain amicable and many CentOS developers are in active contact with Red Hat engineers.
The concept of Gentoo Linux was devised in around the year 2000 by Daniel Robbins, a former Stampede Linux and FreeBSD developer. It was the author’s exposure to FreeBSD and its “autobuild” feature called “ports”, which inspired him to incorporate some of the FreeBSD software management principles into Gentoo under the name of “portage”. The idea was to develop a Linux distribution that would allow users to compile the Linux kernel and applications from source code directly on their own computers, thus maintaining a highly-optimised and always up-to-date system. By the time the project released its 1.0 version in March 2002, Gentoo’s package management was considered a superior alternative to some binary package management systems, especially the then widely-used RPM.
Slackware Linux, created by Patrick Volkerding in 1992, is the oldest surviving Linux distribution. Forked from the now-discontinued SLS project, Slackware 1.0 came on 24 floppy disks and was built on top of Linux kernel version 0.99pl11-alpha. It quickly became the most popular Linux distribution, with some estimates putting its market share to as much as 80% of all Linux installations in 1995. Its popularity decreased dramatically with the arrival of Red Hat Linux and other, more user-friendly distributions, but Slackware Linux still remains a much-appreciated operating system among the more technically-oriented system administrators and desktop users.
PCLinuxOS was first announced in 2003 by Bill Reynolds, better known as “Texstar”. Prior to creating his own distribution, Texstar was already a well-known developer in the Mandrake Linux community of users for building up-to-date RPM packages for the popular distribution and providing them as a free download. In 2003 he decided to build a new distribution, initially based on Mandrake Linux, but with several significant usability improvements. The goals? It should be beginner-friendly, have out-of-the box support for proprietary kernel modules, browser plugins and media codecs, and should function as a live CD with a simple and intuitive graphical installer.