系统版本：
[root@localhost ~]# cat /etc/redhat-release CentOS Linux release 7.6.1810 (Core)
[root@localhost ~]# cat /etc/os-release NAME=”CentOS Linux” VERSION=”7 (Core)” ID=”centos” ID_LIKE=”rhel fedora” VERSION_ID=”7″ PRETTY_NAME=”CentOS Linux 7 (Core)” ANSI_COLOR=”0;31″ CPE_NAME=”cpe:/o:centos:centos:7″ HOME_URL=”https://www.centos.org/” BUG_REPORT_URL=”https://bugs.centos.org/” CENTOS_MANTISBT_PROJECT=”CentOS-7″ CENTOS_MANTISBT_PROJECT_VERSION=”7″ REDHAT_SUPPORT_PRODUCT=”centos” REDHAT_SUPPORT_PRODUCT_VERSION=”7″
以下为脚本内容