用过Redhat9.0，没用过RHEL9.0

用过Redhat9.0，没用过RHEL9.0

严格来说 Redhat9.0 就是 RedHat Linux 9，发布时间 2003年3月31日，相同时期推出了 RHEL3

RHEL9.0 就是 Red Hat Enterprise Linux (RHEL) 9 ，发布时间 2022年5月17日。

接触红帽子Linux时间比较长的人都知道 ，

Red Hat公司提供收费技术支持和更新的Red Hat Enterprise Linux (红帽子Linux企业版)，以及由社区开发的免费的Fedora Core。Fedora Core 1发布于2003年末。

或者说类似这样的演变

      RedHat Linux 9
        /       \      --> 商业模式转换
      RHEL      Fedora
       |               --> 基于RHEL（企业版）源码编译，RHEL下游第三方Linux发行版
  Rocky Linux、Almalinux、CentOS（接近消亡的边缘）、其它……
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History of Red Hat Linux

https://fedoraproject.org/wiki/History_of_Red_Hat_Linux

There has been over a decade of Linux development at Red Hat. This document describes that history, particularly focusing on the development themes for each release of Linux provided by Red Hat. Release History

“You know, it’s a funny thing. We go ahead and do things, and afterward, people go and start making history out of it.” — Fred Weick, Aircraft Designer. For the first decade or so, we did not set out to write the history of Red Hat Linux, so some of this data is a bit fuzzy or conflicting. We hope to do more research into our own past to give more useful data. This history is embryonic. It is intended to give some sense of where we have been, to help build a shared understanding of what we did right, as well as what we have done wrong, in order to continue a tradition of excellence.

In the following table, the Version number is prefaced by “RHL” for Red Hat Linux, “RHEL” for Red Hat Enterprise Linux, and “FC” for Fedora Core.

So……

对于一般用户来说，最好说明自己用的是什么版本Linux，如现在使用的红帽子Linux版本： RHEL9.1 、或者 Redhat企业版Linux 9.1，而不是偷懒写法 Redhat9.0。