练习_(if、case)多系统配置yum源

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

#!/usr/bash/bin yum_server=192.168.201.130 os_version=`cat /etc/redhat-release | awk '{print $4}' | awk -F"." '{print $1"."$2}'`   [ -d /etc/yum.repos.d] || mkdir /etc/yum.repos.d/bak mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak     if [ "$os_version"="7.3" ];then         cat > /etc/yum.repos.d/centos7u3.repo <<-EOF         [centos7u3]         name=centos7u3         baseurl=ftp://$yum_server/centos7u3         gpgcheck=0         EOF         echo "7.3 yum configure.." elif [ "$os_version"="6.8" ];then         curl -o /etc/yum.repos.d/centos6u8.repo ftp://$yum_server/centos6u8 else         echoo "error" fi

　

?

1 2 3 4 5 6 7 8 9 10 11

case格式：     case 变量 in     模式1)         命令序列1         ;;     模式2)         命令序列2         ;;     *)         无匹配后命令序列     esac

　　

　

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

#!/usr/bash/bin yum_server=192.168.201.130 os_version=`cat /etc/redhat-release | awk '{print $4}' | awk -F"." '{print $1"."$2}'`   [ -d /etc/yum.repos.d] || mkdir /etc/yum.repos.d/bak mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak   case $os_version in 7.3)     cat > /etc/yum.repos.d/centos7u3.repo << EOF             [centos7u3]             name=centos7u3             baseurl=ftp://$yum_server/centos7u3             gpgcheck=0     EOF     echo "7.3 yum configure.."     ;; 6.8)     curl -o /etc/yum.repos.d/centos6u8.repo ftp://$yum_server/centos6u8     ;; *) esac