shell脚本判断linux系统，并判断该系统版本号，从而关闭防火墙

#!/bin/bash
# author:qushen



function kill_redhat_firewall(){

source ~/.bashrc

systemver=`cat /etc/redhat-release|sed -r 's/.* ([0-9]+)..*/1/'`

echo $systemver

if [[ $systemver = "6" ]];then
echo "当前是Centos6系统,禁用防火墙"
service iptables stop
chkconfig iptables off
else 
echo "当前是Centos7系统,禁用防火墙"
systemctl disable firewalld
systemctl stop firewalld
fi
}




function kill_ubuntu_firewall(){

source ~/.bashrc

release_num=$(lsb_release -r --short)
release_os=$(lsb_release -i --short)

echo "当前是${release_os}，系统为：${release_num}"

sudo ufw disable

}


function kill_unknown_firewall(){

source ~/.bashrc


echo "当前是未知，无法禁用防火墙，请手动禁用！"

}




# 识别linux为ubantu还是redhat
if [ -f /etc/os-release ]; then
	source /etc/os-release
fi

if [ -f /etc/redhat-release ]; then
	echo "redhat_enable_cron"   kill_redhat_firewall
elif [[ $ID =~ "Ubuntu" || $PRETTY_NAME =~ "Ubuntu" ]]; then
	echo "ubuntu_enable_cron"   kill_ubuntu_firewall
elif [[ $lsb =~ "Debian" || $PRETTY_NAME =~ "Debian" ]]; then
	echo "debian_enable_cron"   kill_unknown_firewall
elif [[ $lsb =~ "SUSE" || $PRETTY_NAME =~ "SUSE" ]]; then
    echo "suse_enable_cron"     kill_unknown_firewall
elif [[ $lsb =~ "NeoKylin" || $PRETTY_NAME =~ "NeoKylin" ]]; then
    echo "中标麒麟：redhat_enable_cron"   kill_redhat_firewall
elif [[ $lsb =~ "Kylin" || $PRETTY_NAME =~ "Kylin" ]]; then
    echo "银河麒麟：ubuntu_enable_cron"   kill_ubuntu_firewall
else
	echo "Warn: Bypass system check"
fi