第二周作业

#!/bin/bash

IP=`ifconfig | sed -rn '2s/^(.*inet )([0-9].+)( +netmask.*)/\2/p'`
echo ${IP}

if [[ $IP =~ [3] ]];then
echo "IP地址包含3，显示系统时间:";echo $(date +%F/%T)
else
echo "批量创建马哥账号"
`groupadd mage |seq -w 100|sed -r "s#(.*)#useradd -g mage mage\1#g"|bash`
fi

`sed -n '/bash/p' /etc/passwd` #打印可登录用户

`yum install -y nginx`