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Linux on z Systems
Linux on z Systems (or Linux on z for short, and previously Linux on System z) is the collective term for the Linux operating system compiled to run on IBM mainframes, especially IBM System z and IBM LinuxONE servers. Other terms with the same meaning include Linux on zEnterprise, Linux on zSeries, Linux/390, zLinux, z/Linux, etc.
==History==
Linux on z originated as two separate efforts to port Linux to IBM's largest servers. The first effort, the "Bigfoot" project, developed by Linas Vepstas in late 1998 through early 1999, was an independent distribution and has since been abandoned. IBM published a collection of patches and additions to the Linux 2.2.13 kernel on December 18, 1999, to start today's mainline Linux on z.〔(【引用サイトリンク】url=http://linuxvm.org/penguinvm/notes.html )〕 Formal product announcements quickly followed in 2000, including the Integrated Facility for Linux (IFL) engines. Think Blue Linux was an early mainframe distribution consisting mainly of Red Hat packages added to the IBM kernel.〔(【引用サイトリンク】url=http://linux.s390.org/ )〕 Commercial Linux distributors introduced mainframe editions very quickly after the initial kernel work.
At the start of IBM's involvement, Linux patches for System z included some ''object code only'' (OCO) modules, without source code. Soon after IBM replaced the OCO modules with open source modules. Linux on z is free software under the GNU General Public License.
According to IBM, by May, 2006, over 1,700 customers were running Linux on their mainframes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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