先更新内核，然后安装nginx。启用bbr。 yum install yum-plugin-copryum copr enable @caddy/caddyyum install caddysudo yum install snapdsudo systemctl enable --now snapd.socketsudo yum install epel-releasesudo yum install snapdsudo systemctl enable --now snapd.socketsudo snap install core; sudo snap refresh corerebootsudo snap install core; sudo snap refresh coresudo snap install coresnap install cor...
1、expr，用于计算变量等用法：expr 表达式用例1：#运算符号和参数之间要有空格分开；[es@bigdata-senior01 ~]$ expr 2 + 3 5#乘号（*）需要用 \ ,"",来转义 [es@bigdata-senior01 ~]$ expr 2 \* 5 10#中间表达式需要用反引号括起来[es@bigdata-senior01 ~]$ expr `expr 2 + 3` \* 5 25或者用$()括起来[es@bigdata-senior01 ~]$ expr $(expr 2 + 3) \* 52 2、let命令，整数运算，与expr类似 与expr命令相比，let命令更简洁直观，...