centos is a version of the linux operating system. Centos is mainly divided into two versions: 1. CentOS Linux version, which is released every two years; 2. CentOS Stream version, which is a rolling update Version means there is no fixed version number.
The operating environment of this article: CentOS 7 system, Dell G3 computer.
Is centos a linux system?
centos is a linux system.
CentOS is a free, open source, and redistributable open source operating system. CentOS (Community Enterprise Operating System, Chinese meaning community enterprise operating system) is one of the Linux distributions.
CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from Red Hat Enterprise Linux (RHEL) in accordance with open source code (mostly GPL open source license) Compiled from the source code specified for release.
Since March 2004, CentOS Linux has been a community-driven open source project designed to be functionally compatible with RHEL.
Introduction
CentOS is the abbreviation of Community Enterprise Operating System, also called community enterprise operating system. It is a recompiled version (a re-released version) of Red Hat Enterprise Linux (hereinafter referred to as RHEL), the leader in enterprise Linux distributions, and has fixed many known bugs on the basis of RHEL. Compared with other Linux distributions version, its stability is trustworthy.
CentOS is free. You can use it to build an enterprise-level Linux system environment just like RHEL, but you do not need to pay any fees to RedHat. CentOS technical support is mainly provided through the community's official mailing list, forums and chat rooms.
Each version of CentOS is supported (via security updates) for ten years, with new versions of CentOS released approximately every two years. Each version of CentOS is updated regularly (about every six months) to support new hardware. In this way, a secure, low-maintenance, stable, highly predictable, and highly repeatable Linux environment is established.
Features
1. CentOS can be understood as the community version of the Red Hat AS series. It is completely improved and released on Red Hat AS. Various operations and uses are no different from RHEL.
2. CentOS is completely free, and there is no problem that RED HAT AS requires a serial number.
3. CentOS's unique yum command supports online upgrades, which can update the system instantly. Unlike RHEL, which requires spending money to purchase support services.
4. CentOS has fixed many RHEL bugs.
5. CentOS version notes: CentOS3.1 is equivalent to RED HAT AS3 Update1 CentOS3.4 is equivalent to RED HAT AS3 Update4 CentOS4.0 is equivalent to RED HAT AS4.
Version classification
CentOS is mainly divided into two main versions, CentOS Linux and CentOS Stream version.
1. The Linux version is released every two years, and each version of the system will provide 10 years of security maintenance support.
2. The Stream version is a rolling update version, which means there is no fixed version number and the specific content is dynamically updated.
Recommended tutorial: "centos tutorial"
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查版本号的命令:1、“cat /etc/issue”或“cat /etc/redhat-release”,可输出centos版本号;2、“cat /proc/version”、“uname -a”或“uname -r”,可输出内核版本号。

centos重启网卡的方法:1、对于centos6的网卡重启命令是“service network restart”;2、对于centos7的网卡重启命令是“systemctl restart network”。

centos php安装opcache的方法:1、执行“yum list php73* | grep opcache”命令;2、通过“yum install php73-php-opcache.x86_64”安装opcache;3、使用“find / -name opcache.so”查找“opcache.so”的位置并将其移动到php的扩展目录即可。

centos离线安装mysql的方法:1、将lib中的所有依赖上传到linux中,并用yum命令进行安装;2、解压MySQL并把文件复制到想要安装的目录;3、修改my.cnf配置文件;4、复制启动脚本到资源目录并修改启动脚本;5、将mysqld服务加入到系统服务里面;6、将mysql客户端配置到环境变量中,并使配置生效即可。

centos7安装不出现界面的解决办法:1、选择“Install CentOS 7”,按“e”进入启动引导界面;2、 将“inst.stage2=hd:LABEL=CentOS\x207\x20x86_64”改为“linux dd”;3、重新进入“Install CentOS 7”,按“e”将“hd:”后的字符替换成“/dev/sdd4”,然后按“Ctrl+x”执行即可。

centos删除php的方法:1、通过“#rpm -qa|grep php”命令查看全部php软件包;2、通过“rpm -e”命令卸载相应的依赖项;3、重新使用“php -v”命令查看版本信息即可。

我们的PC中有一个磁盘驱动器专门用于所有与Windows操作系统相关的安装。该驱动器通常是C驱动器。如果您还在PC的C盘上安装了最新的Windows11操作系统,那么所有系统更新(很可能是您安装的所有软件)都会将其所有文件存储在C盘中。因此,保持此驱动器没有垃圾文件并在C驱动器中拥有足够的存储空间变得非常重要,因为该驱动器拥有的空间越多,您的Windows11操作系统运行起来就越顺畅。但是您可以在磁盘驱动器上增加多少空间以及可以删除多少文件是有限制的。在这种情况下,

方法:1、利用“vim ~/.bashrc”编辑用户目录(~)下的“.bashrc”文件;2、在文件内添加“alias ls="ls --color"”;3、利用“:wq!”命令保存文件内的更改;4、“exit”命令退出终端后重新连接即可。


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