# root基本命令

## 添加新用户

`useradd 用户名 -d 家目录`

## 查看用户登录记录

```bash
 last -f /var/log/wtmp|less
```

## 配置DNS解析服务器

参考 <https://www.cnblogs.com/wtliu/p/9334638.html>

```bash
cat  /etc/resolv.conf
## DNS服务器地址
nameserver 8.8.8.8
nameserver 8.8.4.4
```

## 根据端口号杀死程序

```bash
### 获取端口号
netstat -lnp|grep 80
#tcp        0      0 :::80                       :::*                        LISTEN      35894/node 
### 杀死对应程序
```

## 快速删除大文件夹

当一个文件夹中包含有很多小文件的时候，使用`rsync`命令快速删除文件夹

* 首先创建一个空文件夹，利用这个空文件夹快速删除目标文件夹

```bash
rsync --delete-before -a -H -v --progress --stats  /home/aniya/空文件夹 目标文件夹
```

## SSH转发信号

```bash
ssh -L 3306:localhost:3306 账号@服务器地址 -p 22
```

[![6B2KiD.png](https://s3.ax1x.com/2021/03/15/6B2KiD.png)](https://imgtu.com/i/6B2KiD)


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