shell 脚本 常规操作

#!/bin/bash 


#检查输入的参数
if [ $# != 3 ] ; then
echo "参数输入格式不对"
echo "例如: $0 A B C "
echo "参数1：XX"
echo "参数2：XX"
echo "参数3：XX"
exit
fi


#获取网卡名称
check_iface() {
  def_iface=$(route 2>/dev/null | grep -m 1 '^default' | grep -o '[^ ]*$')
  [ -z "$def_iface" ] && def_iface=$(ip -4 route list 0/0 2>/dev/null | grep -m 1 -Po '(?<=dev )(\S+)')
  def_state=$(cat "/sys/class/net/$def_iface/operstate" 2>/dev/null)
  if [ -n "$def_state" ] && [ "$def_state" != "down" ]; then
    if ! uname -m | grep -qi -e '^arm' -e '^aarch64'; then
      case $def_iface in
        wl*)
          exiterr "Wireless interface '$def_iface' detected. DO NOT run this script on your PC or Mac!"
          ;;
      esac
    fi
    NET_IFACE="$def_iface"
  else
    eth0_state=$(cat "/sys/class/net/eth0/operstate" 2>/dev/null)
    if [ -z "$eth0_state" ] || [ "$eth0_state" = "down" ]; then
      exiterr "Could not detect the default network interface."
    fi
    NET_IFACE=eth0
  fi
  echo "物理网卡名称 ：$NET_IFACE"
}
check_iface




DIR=/usr/lib/node_modules

if [[  ! -d $DIR ]];then
  mkdir /usr/lib/node_modules
fi

if [ -f /usr/local/src/xxx.zip ];then
    unzip -d /usr/lib/node_modules/ /usr/local/src/xxx.zip
else 
    echo "xxx.zip文件不存在,请先上传文件!"
  exit
fi



#修改配置
DEVDIR=/etc/devname.conf
if [[ $? -eq 0 ]];then
   echo -e "\033[32m 正在修改devname.conf配置....\033[0m"
  > DEVDIR
  echo '{
"name":"'${3}'"
}' > $DEVDIR
fi


#给脚本追加
IPSSECRETSDIR=/etc/ipsec.secrets
if [[ $? -eq 0 ]];then
   echo -e "\033[32m 正在修改ipsec.conf配置....\033[0m"
  > IPSSECRETSDIR
  echo '  : PSK "'${3}'"' >> $IPSSECRETSDIR
fi

#判断版本号
release_num=$(lsb_release -r --short)
if [[ $? -eq 0 ]];then
  if [ $release_num == 18.04 ];then
    systemctl stop strongswan
    systemctl start strongswan
  else
    systemctl stop strongswan-starter.service
    systemctl start strongswan-starter.service
  fi 
fi


#开机自启动配置开始
RCLOCALSERDIR=/etc/systemd/system/rc-local.service
if [[ $? -eq 0 ]];then
  echo -e "\033[32m 新建rc-local.service...\033[0m"
  if [ ! -f $RCLOCALSERDIR ];then
      touch $RCLOCALSERDIR
  fi
fi

if [[ $? -eq 0 ]];then
   echo -e "\033[32m 正在设置开机自动执行服务....\033[0m"
  > RCLOCALSERDIR
  echo '[Unit]
Description=/etc/rc.local Compatibility
ConditionPathExists=/etc/rc.local
After=network.target

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
StandardOutput=tty
RemainAfterExit=yes
SysVStartPriority=99

[Install]
WantedBy=multi-user.target
' > $RCLOCALSERDIR
fi

RCLOCALCFGDIR=/etc/rc.local
if [[ $? -eq 0 ]];then
  echo -e "\033[32m 新建rc.local..\033[0m"
  if [ ! -f $RCLOCALCFGDIR ];then
      touch $RCLOCALCFGDIR
  fi
fi

if [[ $? -eq 0 ]];then
   echo -e "\033[32m 正在设置开机自动执行脚本....\033[0m"
  > RCLOCALCFGDIR
  echo '#!/bin/bash
iptables -t nat -A PREROUTING -p tcp -m tcp ! --dport 26881 -s 11.0.0.0/8 ! -d 11.0.0.0/8 -j REDIRECT --to-ports 7000
iptables -t nat -I POSTROUTING -o '$NET_IFACE' -j MASQUERADE
exit 0' > $RCLOCALCFGDIR
fi

if [[ $? -eq 0 ]];then
  chmod 754 /etc/rc.local
  systemctl enable rc-local
fi

#开机自启动配置结束

if [[ $? -eq 0 ]];then
  echo -e "\033[32m 关闭防火墙...\033[0m"
  ufw disable
fi

参考：https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/vpnsetup_ubuntu.sh