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期间，此处已知Linux系统是CentOS8
但是想要确认一下。
想要确认是哪个发行版，是不是CentOS，结果：
[root@ecs-38292 ~]# cat /proc/*-release cat: '/proc/*-release': No such file or directory [root@ecs-38292 ~]# cat /proc//etc/*-release cat: '/proc//etc/*-release': No such file or directory
找不到。
cat /proc/version
[root@ecs-38292 ~]# cat /proc/version Linux version 4.18.0-240.10.1.el8_3.x86_64 ( mockbuild@kbuilder.bsys.centos.org ) (gcc version 8.3.1 20191121 (Red Hat 8.3.1-5) (GCC)) #1 SMP Mon Jan 18 17:05:51 UTC 2021
也没写CentOS
不过其实
中有centos
[root@ecs-38292 ~]# ls /etc | grep release centos-release centos-release-upstream lsb-release.d os-release redhat-release system-release system-release-cpe
有：centos-release ？
[root@ecs-38292 ~]# cat /etc/centos-release centos-release centos-release-upstream [root@ecs-38292 ~]# cat /etc/centos-release-upstream Derived from Red Hat Enterprise Linux 8.2 (Source) [root@ecs-38292 ~]# cat /etc/centos-release CentOS Linux release 8.2.2004 (Core) [root@ecs-38292 ~]# cat /etc/lsb-release.d/core-4.1- core-4.1-amd64 core-4.1-noarch [root@ecs-38292 ~]# cat /etc/lsb-release.d/core-4.1-amd64 [root@ecs-38292 ~]# cat /etc/lsb-release.d/core-4.1-noarch
以及：
[root@ecs-38292 ~]# cat /etc/os-release NAME="CentOS Linux" VERSION="8 (Core)" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="8" PLATFORM_ID="platform:el8" PRETTY_NAME="CentOS Linux 8 (Core)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:8" HOME_URL="https://www.centos.org/" BUG_REPORT_URL="https://bugs.centos.org/" CENTOS_MANTISBT_PROJECT="CentOS-8" CENTOS_MANTISBT_PROJECT_VERSION="8" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="8"
以及：
[root@ecs-38292 ~]# cat /etc/re redhat-lsb/ redhat-release resolv.conf [root@ecs-38292 ~]# cat /etc/redhat-release CentOS Linux release 8.2.2004 (Core) [root@ecs-38292 ~]# cat /etc/redhat-lsb/ cat: /etc/redhat-lsb/: Is a directory [root@ecs-38292 ~]# cat /etc/redhat-lsb/lsb_ lsb_killproc lsb_log_message lsb_pidofproc lsb_start_daemon [root@ecs-38292 ~]# cat /etc/redhat-lsb/lsb_^C
和：
[root@ecs-38292 ~]# cat /etc/system-release CentOS Linux release 8.2.2004 (Core)
和：
[root@ecs-38292 ~]# cat /etc/system-release-cpe cpe:/o:centos:centos:8
另外，发现有lsb_release：
[root@ecs-38292 ~]# which lsb_release /usr/bin/lsb_release
去试试：
[root@ecs-38292 ~]# lsb_release LSB Version: :core-4.1-amd64:core-4.1-noarch
不加参数，输出内容很少啊
去加上-a：
[root@ecs-38292 ~]# lsb_release -a LSB Version: :core-4.1-amd64:core-4.1-noarch Distributor ID: CentOS Description: CentOS Linux release 8.2.2004 (Core) Release: 8.2.2004 Codename: Core
【总结】
此处，查看Linux是哪个发行版。
对于此处的CentOS 8：
（1）是有lsb_release的
# which lsb_release /usr/bin/lsb_release
然后即可用：
lsb_release -a
此处输出：
# lsb_release -a LSB Version: :core-4.1-amd64:core-4.1-noarch Distributor ID: CentOS Description: CentOS Linux release 8.2.2004 (Core) Release: 8.2.2004 Codename: Core
（2）/etc/下面有多个release
[root@ecs-38292 ~]# ls /etc | grep release centos-release centos-release-upstream lsb-release.d os-release redhat-release system-release system-release-cpe
其中能输出CentOS的有：
# cat /etc/centos-release CentOS Linux release 8.2.2004 (Core)
和：
# cat /etc/centos-release-upstream Derived from Red Hat Enterprise Linux 8.2 (Source)
和：
# cat /etc/os-release NAME="CentOS Linux" VERSION="8 (Core)" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="8" PLATFORM_ID="platform:el8" PRETTY_NAME="CentOS Linux 8 (Core)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:8" HOME_URL="https://www.centos.org/" BUG_REPORT_URL="https://bugs.centos.org/" CENTOS_MANTISBT_PROJECT="CentOS-8" CENTOS_MANTISBT_PROJECT_VERSION="8" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="8"
和：
# cat /etc/redhat-release CentOS Linux release 8.2.2004 (Core)
和：
# cat /etc/system-release CentOS Linux release 8.2.2004 (Core)
和：
# cat /etc/system-release-cpe cpe:/o:centos:centos:8
（3）cat /proc/version
# cat /proc/version Linux version 4.18.0-240.10.1.el8_3.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 8.3.1 20191121 (Red Hat 8.3.1-5) (GCC)) #1 SMP Mon Jan 18 17:05:51 UTC 2021
-》其中只有邮件后缀中有 centos
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