Linux Shell Scripting _ turn off the firewall

① Scripting
to create scripts

vim closeFirewall.sh

Add the script reads as follows:

if egrep "7.[0-9]" /etc/redhat-release &>/dev/null; then
    systemctl stop firewalld
    systemctl disable firewalld
elif egrep "6.[0-9]" /etc/redhat-release &>/dev/null; then
    service iptables stop
    chkconfig iptables off
fi

Saving exit :wq
② run scripts

chmod u+x closeFirewall.sh
./closeFirewall.sh
或者
bash closeFirewall.sh

③ script Description of content

这是一个centos7和centos6 2个版本防火墙脚本
先去查看/etc/redhat-release文件中的系统版本内容，然后用正则表达式区配7.x还是6.x，然后使用管道命令过滤，最后，针对不同系统走不同分支