Scientific Linux是重新编译的Red Hat Enterprise
Linux，由费米国家加速器实验室和欧洲核研究组织（CERN）共同开发。尽管它旨在与Red Hat Enterprise
Linux完全兼容，它也提供了上游产品中未收入的额外软件包，这当中最值得一提的是各种文件系统，包括Cluster Suite和Global
File
System（GFS）、FUSE、OpenAFS、Squashfs、Unionfs，以及对Intel无线固件的无线网络支持、MadWiFi和
NDISwrapper、Sun Java及Java Development
Kit（JDK）、轻量级的IceWM窗口管理器、面向统计计算的R语言环境，以及Alpine邮件客户端。
Troy Dawson has announced the release of Scientific
Linux 4.9. This is the project's legacy 4.x release, based on Red Hat
Enterprise Linux 4.9, and is likely to be the last official version in
the series that features Linux kernel 2.6.9, glibc 2.3.4, GCC 3.4.6,
X.Org 6.8.2, GNOME 2.8 and KDE 3.3. From the release announcement: "Scientific
Linux 4.9 has been released. Scientific Linux 4.9 contains almost two
years of security and bug fixes. There are no new features or packages,
but it is a nice stable release. Scientific Linux release 4.9 is based
on the rebuilding of RPMs out of source RPMs from Enterprise 4,
including Update 9. It also has all errata and bug fixes up until April
19, 2011." See also the release notes
for a detailed list of changes, security and bug fixes. As always, the
distribution can be updated to the latest version via the usual
channels. For those who need fresh installation media, a 6-CD
installation sets for i386 and x86_64 architectures are available for download from the Scientific Linux download servers.
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