# axel: 多线程下载

## 说明

axel插件是基于yum下的一个多线程下载.

## 安装

在Ubuntu上直接使用`apt`安装最新版本.

```
sudo apt install axel
```

## 使用

```
[root@mvp ~]# axel -h
Usage: axel [options] url1 [url2] [url...]

--max-speed=x -s x Specify maximum speed (bytes per second) //速度限制
--num-connections=x -n x Specify maximum number of connections //连接数
--output=f -o f Specify local output file
--search[=x] -S [x] Search for mirrors and download from x servers
--header=x -H x Add header string
--user-agent=x -U x Set user agent
--no-proxy -N Just don't use any proxy server
--quiet -q Leave stdout alone
--verbose -v More status information
--alternate -a Alternate progress indicator //进度条（交替显示）
--help -h This information
--version -V Version information
```

其中重要的参数有:

* `-a`: 显示进度条
* `-n`: 指定连接线程数量, 一般使用10即可, 即`-n 10`
* `-s`: 速度限制, 每秒下载的字节数, 限制每秒下载1k, 使用`-s 1024`

一般使用方法:

```
axel -a -n 10 http://xxx.com/xxx.deb
```


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