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Red Hat Enterprise Linux (RHEL) is a Linux distribution developed by Red Hat and targeted toward the commercial market. Red Hat Enterprise Linux is released in server versions for x86, x86-64, Itanium, PowerPC and IBM System z, and desktop versions for x86 and x86-64. All of the Red Hat's official support and training, together with the Red Hat Certification Program, focuses on the Red Hat Enterprise Linux platform. Red Hat Enterprise Linux is often abbreviated to RHEL, although this is not an official designation. The first version of Red Hat Enterprise Linux to bear the name originally came onto the market as "Red Hat Linux Advanced Server". In 2003 Red Hat rebranded Red Hat Linux Advanced Server to "Red Hat Enterprise Linux AS", and added two more variants, Red Hat Enterprise Linux ES and Red Hat Enterprise Linux WS. Red Hat uses strict trademark rules to restrict free re-distribution of their officially supported versions of Red Hat Enterprise Linux,〔(【引用サイトリンク】url=http://www.onlamp.com/pub/a/onlamp/2005/06/30/esr_interview.html )〕 but still freely provides its source code. Third-party derivatives can be built and redistributed by stripping away non-free components like Red Hat's trademarks, including community-supported distributions like CentOS and Scientific Linux, and commercial forks like Oracle Linux, which aim to offer 100% binary compatibility with Red Hat Enterprise Linux. ==Variants== There are also "Academic" editions of the Desktop and Server variants. They are offered to schools and students, are less expensive, and are provided with Red Hat technical support as an optional extra. Web support based on number of customer contacts can be purchased separately. It is often assumed the branding ES, AS, and WS stand for "Entry-level Server", "Advanced Server" and "Work Station", respectively. The reason for this is that the ES product is indeed the company's base enterprise server product, while AS is the more advanced product. However, nowhere on its site or in its literature does Red Hat say what AS, ES and WS stand for. In Red Hat Enterprise Linux 5 there are new editions that substitute former Red Hat Enterprise Linux AS/ES/WS/Desktop: * Red Hat Enterprise Linux Advanced Platform (former AS) * Red Hat Enterprise Linux (former ES) (limited to two CPUs) * Red Hat Enterprise Linux Desktop with Workstation and Multi-OS option * Red Hat Enterprise Linux Desktop with Workstation option (former WS) * Red Hat Enterprise Linux Desktop with Multi-OS option * Red Hat Enterprise Linux Desktop (former Desktop) Red Hat had also announced its Red Hat Global Desktop Linux edition "for emerging markets".〔(【引用サイトリンク】url=http://www.linuxtoday.com/news_story.php3?ltsn=2007-08-03-031-26-OP-RH-SW )〕 RHEL 4, 3, and prior releases had four variants: * Red Hat Enterprise Linux AS for mission-critical/enterprise computer systems. * Red Hat Enterprise Linux ES for supported network servers * Red Hat Enterprise Linux WS for technical power user enterprise desktops for high-performance computing * Red Hat Desktop for multiple deployments of single-user desktops for enterprises. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Red Hat Enterprise Linux」の詳細全文を読む スポンサード リンク
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